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Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
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1

International Rectifier Power Control Systems | Open Energy Information  

Open Energy Info (EERE)

Rectifier Power Control Systems Rectifier Power Control Systems Jump to: navigation, search Name International Rectifier Power Control Systems Place El Segundo, California Zip 90245 Product Originally a division of International Rectifier Corporation manufacturing semiconductor and module components for power management products. References International Rectifier Power Control Systems[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. International Rectifier Power Control Systems is a company located in El Segundo, California . References ↑ "International Rectifier Power Control Systems" Retrieved from "http://en.openei.org/w/index.php?title=International_Rectifier_Power_Control_Systems&oldid=347055"

2

A Mixed-SignalASIC Power-Factor-Correction(PFC) Controller for High Frequency Switching Rectifiers  

E-Print Network [OSTI]

Regan Zane and Dragan MaksimoviC ColoradoPower Electronics Center (CoPEC) Department of Electrical-chip controller block dia- gram is described, and the fundamental analog and digital op- erating blocks proliferationof electronic systems throughout the home andof- ficeplacesnew constraints on front-end AC

3

NONLINEAR-CARRIER CONTROL FOR HIGH-POWER-FACTOR RECTIFIERS BASED ON  

E-Print Network [OSTI]

, flyback, Cuk and Sepic converters offer the benefits of single-stage transformer isolation, voltage step-up-power- factor rectification. A simple exponential carrier waveform generator is described. Using the NLC con generator is discussed in Section 4. Design-oriented har- monic distortion analysis and modeling aspects

4

SiC MOSFET Based Single Phase Active Boost Rectifier with Power Factor Correction for Wireless Power Transfer Applications  

SciTech Connect (OSTI)

Wireless Power Transfer (WPT) technology is a novel research area in the charging technology that bridges the utility and the automotive industries. There are various solutions that are currently being evaluated by several research teams to find the most efficient way to manage the power flow from the grid to the vehicle energy storage system. There are different control parameters that can be utilized to compensate for the change in the impedance due to variable parameters such as battery state-of-charge, coupling factor, and coil misalignment. This paper presents the implementation of an active front-end rectifier on the grid side for power factor control and voltage boost capability for load power regulation. The proposed SiC MOSFET based single phase active front end rectifier with PFC resulted in >97% efficiency at 137mm air-gap and >95% efficiency at 160mm air-gap.

Onar, Omer C [ORNL] [ORNL; Tang, Lixin [ORNL] [ORNL; Chinthavali, Madhu Sudhan [ORNL] [ORNL; Campbell, Steven L [ORNL] [ORNL; Miller (JNJ), John M. [JNJ-Miller PLC] [JNJ-Miller PLC

2014-01-01T23:59:59.000Z

5

Design and Realization of Autonomous Power CMOS Single Phase Inverter and Rectifier for Low Power Conditioning Applications  

E-Print Network [OSTI]

Design and Realization of Autonomous Power CMOS Single Phase Inverter and Rectifier for Low Power operate as an inverter or as a rectifier in a wide range of power flows and input voltages. Three of the inverter reaches up to 92% as a function of input voltage with these conditions. The second experimental

Paris-Sud XI, Université de

6

A new high performance AC to DC rectifier with input power factor correction and harmonic reduction capacity  

E-Print Network [OSTI]

Many conventional switching power supplies in data processing equipment and low power motor drive systems operate by rectifying the input ac line voltage and filtering it with large electrolytic capacitors. Because this process involves both...

Martinez, Roberto

2012-06-07T23:59:59.000Z

7

Rectifier cabinet static breaker  

DOE Patents [OSTI]

A rectifier cabinet static breaker replaces a blocking diode pair with an SCR and the installation of a power transistor in parallel with the latch contactor to commutate the SCR to the off state. The SCR serves as a static breaker with fast turnoff capability providing an alternative way of achieving reactor scram in addition to performing the function of the replaced blocking diodes. The control circuitry for the rectifier cabinet static breaker includes on-line test capability and an LED indicator light to denote successful test completion. Current limit circuitry provides high-speed protection in the event of overload.

Costantino, Jr, Roger A. (Mifflin, PA); Gliebe, Ronald J. (Library, PA)

1992-09-01T23:59:59.000Z

8

Multi-Pulse SCR Rectifiers.  

E-Print Network [OSTI]

??This thesis presents the introduction, analysis and experimental verification of the six-pulse SCR rectifier and multi-pulse SCR rectifiers. As a fundamental three-phase controllable ac-dc converter, (more)

Li, Mei

2005-01-01T23:59:59.000Z

9

Application of fuzzy logic control algorithm as stator power controller of a grid-connected doubly-fed induction generator  

Science Journals Connector (OSTI)

This paper discusses the power outputs control of a grid-connected doubly-fed induction generator (DFIG) for a wind power generation systems. The DFIG structure control has a six diode rectifier ... order to cont...

Ridha Cheikh; Arezki Menacer; Said Drid; Mourad Tiar

2013-03-01T23:59:59.000Z

10

Microwave Metamaterial Applications using Complementary Split Ring Resonators and High Gain Rectifying Reflectarray for Wireless Power Transmission  

E-Print Network [OSTI]

. ..................................................................................... 50 Fig. 28. (a) Half-wave rectifier with capacitor and (b) its waveforms ............................ 52 Fig. 29. Diode current-voltage characteristic curves with the incident fundamental and diode junction voltage waveforms... and 1930?s. In the 1950?s, the development of high power and efficiency micrwave tube by Raytheon Company [18] opened the modern WPT era. The first rectenna was invented in the 1960?s by combining a half-wave dipole antenna and a single diode by W...

Ahn, Chi Hyung

2011-10-21T23:59:59.000Z

11

Maximum power point tracker for solar arrays using controlled rectifier.  

E-Print Network [OSTI]

??M.S. Solar energy offers a large potential as a source of energy and in light of financial and ethical reasons, people are looking to harvest (more)

Manadan, Anvin Joe, 1987-

2012-01-01T23:59:59.000Z

12

International Rectifier Corporation | Open Energy Information  

Open Energy Info (EERE)

Rectifier Corporation Rectifier Corporation Jump to: navigation, search Name International Rectifier Corporation Place El Segundo, California Zip 90245 Product Manufacturer of analog and mixed signal ICs, advanced circuit devices, integrated power systems and components that enable high performance of end products in home appliances, industrial motor-driven equipment, autos, and information technology. References International Rectifier Corporation[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. International Rectifier Corporation is a company located in El Segundo, California . References ↑ "International Rectifier Corporation" Retrieved from "http://en.openei.org/w/index.php?title=International_Rectifier_Corporation&oldid=347054"

13

Modeling of Electronically Commutated Motor Controlled Fan-powered Terminal Units  

E-Print Network [OSTI]

Feet Per Minute ECM Electronically Commutated Motor FPTU Fan Powered Terminal Unit Pdown Downstream Static Pressure PF Power Factor Pup Upstream Static Pressure SCR Silicon Controlled Rectifier THD Total Harmonic Distortion VAV Variable Air... parallel unit pressurizes the FPTU causing some of the primary air to leak out of the unit. Another difference between them is that series terminal units allow the primary air system to operate at a lower static pressure because the terminal unit fan...

Edmondson, Jacob Lee

2011-02-22T23:59:59.000Z

14

6.334 Power Electronics, Spring 2003  

E-Print Network [OSTI]

The application of electronics to energy conversion and control; phase-controlled rectifier/inverter circuits, dc/dc converters, high-frequency inverters, and motion control systems. Characteristics of power semiconductor ...

Perreault, David John

15

Stirling engine power control  

DOE Patents [OSTI]

A power control method and apparatus for a Stirling engine including a valved duct connected to the junction of the regenerator and the cooler and running to a bypass chamber connected between the heater and the cylinder. An oscillating zone of demarcation between the hot and cold portions of the working gas is established in the bypass chamber, and the engine pistons and cylinders can run cold.

Fraser, James P. (Scotia, NY)

1983-01-01T23:59:59.000Z

16

Theoretical and experimental study of 2.45 GHz rectifying antennas  

E-Print Network [OSTI]

This thesis presents a study on 2.45 GHz rectifying antennas (rectennas). The rectenna is a major component in a microwave power transmission system. The main feature is the conversion efficiency from microwave power to direct current (DC) power...

McSpadden, James Oliver

2012-06-07T23:59:59.000Z

17

Digital SCR Control Box for Educational Laboratory Zakdy Sorchini,Jonathan W. Kimball and Philip T. Krein  

E-Print Network [OSTI]

Digital SCR Control Box for Educational Laboratory Zakdy Sorchini,Jonathan W. Kimball and Philip T designed to introduce the silicone controlled rectifier (SCR) to power electronicsstudents. SCRs are useful, I. INTRODUCTION The silicon controlled rectifier (SCR) is an important device in the context

Kimball, Jonathan W.

18

Digital regulation of a phase controlled power converter  

SciTech Connect (OSTI)

The Relativistic Heavy Ion Collider, now in construction at Brookhaven National Laboratory, will use phase controlled power converters for the main dipole and quadrupole magnet strings. The rectifiers in these power supplies will be controlled by a digital regulator based on the TI 320C30 Digital Signal Processor (DSP). The DSP implements the current loop, the voltage loop, and a system to actively reduce the sub-harmonic ripple components. Digital firing circuits consisting of a phase locked lop and counters are used to fire the SCRs. Corrections for the sub-harmonic reduction are calculated by the DSP and stored in registers in the firing circuit. These corrections are added in hardware, to the over-all firing count provided by the DSP. the resultant count is compared to a reference counter to fire the SCRs. This combination of a digital control system and the digital firing circuits allows the correction of the sub-harmonics in a real-time sense. A prototype of the regulator has been constructed, and the preliminary testing indicates a sub-harmonic reduction of 60 dB.

Schultheiss, C.; Haque, T.

1995-12-01T23:59:59.000Z

19

Reducing Power Load Fluctuations on Ships Using Power Redistribution Control  

E-Print Network [OSTI]

is supplied from generators driven by diesel en- gines, gas engines, and/or gas/steam turbines. In a powerReducing Power Load Fluctuations on Ships Using Power Redistribution Control Damir Radan,1 Asgeir J generated by consumers operating in marine power systems is proposed. The controller redistributes the power

Johansen, Tor Arne

20

Sandia National Laboratories: power flow control system  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

power flow control system ECIS-Princeton Power Systems, Inc.: Demand Response Inverter On March 19, 2013, in DETL, Distribution Grid Integration, Energy, Energy Surety, Facilities,...

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Rectifiers used on the London Underground Railways  

Science Journals Connector (OSTI)

... Lunn to the Institution of Electrical Engftieers on November 7, a description of the rectifier substations is given and also much useful information of the working of these rectifiers for traction ... there is little vibration; but in these respects the rectifier is much superior. The substation buildings for operating the traction system of the London Underground are in very densely populated ...

1935-11-30T23:59:59.000Z

22

Active Power Controls from Wind Power: Bridging the Gaps  

SciTech Connect (OSTI)

This paper details a comprehensive study undertaken by the National Renewable Energy Laboratory, Electric Power Research Institute, and the University of Colorado to understand how the contribution of wind power providing active power control (APC) can benefit the total power system economics, increase revenue streams, improve the reliability and security of the power system, and provide superior and efficient response while reducing any structural and loading impacts that may reduce the life of the wind turbine or its components. The study includes power system simulations, control simulations, and actual field tests using turbines at NREL's National Wind Technology Center (NWTC). The study focuses on synthetic inertial control, primary frequency control, and automatic generation control, and analyzes timeframes ranging from milliseconds to minutes to the lifetime of wind turbines, locational scope ranging from components of turbines to large wind plants to entire synchronous interconnections, and additional topics ranging from economics to power system engineering to control design.

Ela, E.; Gevorgian, V.; Fleming, P.; Zhang, Y. C.; Singh, M.; Muljadi, E.; Scholbrook, A.; Aho, J.; Buckspan, A.; Pao, L.; Singhvi, V.; Tuohy, A.; Pourbeik, P.; Brooks, D.; Bhatt, N.

2014-01-01T23:59:59.000Z

23

Flex power perspectives of indirect power system control through dynamic  

Open Energy Info (EERE)

Flex power perspectives of indirect power system control through dynamic Flex power perspectives of indirect power system control through dynamic power price (Smart Grid Project) Jump to: navigation, search Project Name Flex power perspectives of indirect power system control through dynamic power price Country Denmark Coordinates 56.26392°, 9.501785° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":56.26392,"lon":9.501785,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

24

NREL: Transmission Grid Integration - Active Power Controls  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Active Power Controls Active Power Controls NREL has teamed with the Electric Power Research Institute, the Colorado School of Mines, the University of Colorado, and other industry members to research the potential of wind turbines and power plants to provide active power control (also known as real power or frequency control) to the electric power system. Under this multiyear project, researchers will perform simulations and field tests at the National Wind Technology Center to analyze system benefits and impacts on the operations of wind turbines and the electric power system. The project considers five topics: Steady state and economics Dynamic interconnection stability Controls design and simulation Controls testing and loads and structural impacts Dissemination of results.

25

Magnetically Controlled Reactor Shrinks Power Quality Costs and Power  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Magnetically Controlled Reactor Shrinks Power Quality Costs and Power Magnetically Controlled Reactor Shrinks Power Quality Costs and Power Losses Speaker(s): Mark D. Galperin Date: December 18, 2000 - 12:00pm Location: Bldg. 90 Seminar Host/Point of Contact: Diana Morris In a new, magnetically controlled reactor (MCR), in which DC pulsing through a special winding controls inductive susceptance, high saturation of the magnetic circuit steel with optimal magnetic and electrical circuit parameters ensures less than 2-3% main harmonic distortion even without special filters. Transformer-like construction ensures reliable operation. MCR's increase power quality through automatic voltage regulation, reduced fluctuation, and smoothing of reactive power surges at 1/2 the cost of thyristor-controlled reactors (TCR's). Damping of voltage-oscillation

26

Active Power Controls from Wind Power: Bridging the Gaps  

Broader source: Energy.gov [DOE]

This report evaluates how wind power can support power system reliability, and do so economically. The study includes a number of different power system simulations, control simulations, and actual field tests using turbines at the National Renewable Energy Laboratory's (NRELs) National Wind Technology Center (NWTC).

27

Wind Power System Simulation of Switch Control  

Science Journals Connector (OSTI)

In order to find a balance between energy efficiency and reliability of wind power generation system, this paper presents a ... switch control strategy. This paper establishes a wind power system simulation model...

Yuehua Huang; Guangxu Li; Huanhuan Li

2014-01-01T23:59:59.000Z

28

PO. 254 Control of Power Train Loads  

E-Print Network [OSTI]

Abstract summary Variable loads along the power train are the primary cause attributed to the failure of gears, bearings, and other mechanical components. The concept of anticipatory control applied to a wind power train is presented. This new approach to power train load management is based on the data reflecting the current status of the power train. The model driving the optimization of the power train loads considers four different objectives, including minimization of the torque variability and power maximization. A software tool for power train load management is presented. This new approach to power train load control is based on the data reflecting the current status of the power train. Such data is collected by a typical SCADA system. The model driving the optimization of the power train loads considers four different objectives, including minimization of the torque variability and power maximization. Details of the model that is applicable to different turbines are presented Objectives Goal: Transform a wind a farm into a wind power plant Example objectives: ? Minimization of the torque ramp rate ? Maximization of the power produced ? Maximization of the power quality Modify the shape of the power curve Methods Data mining/Knowledge discovery

Andrew Kusiak

29

Recovery Act: High-Efficiency, Wideband Three-Phase Rectifiers and Adaptive Rectifier Management for Telecomm Central Office and Large Data Center Applications  

SciTech Connect (OSTI)

Lineage Power and Verizon teamed up to address a DOE funding opportunity focused on improving the power conversion chain in telecommunications facilities and data centers. The project had three significant elements: the design and development of high efficiency and high power three-phase rectifiers by Lineage Power, design and development of software to optimize overall plant energy efficiency by Lineage Power, and a field trial in active Verizon telecommunications facilities where energy consumption was measured before and after efficiency upgrades.

Mark A. Johnson

2012-06-29T23:59:59.000Z

30

Control power in perfect controlled teleportation via partially entangled channels  

E-Print Network [OSTI]

We analyze and evaluate perfect controlled teleportation via three-qubit entangled channels from the point of view of the controller. The key idea in controlled teleportation is that the teleportation is performed only with the participation of the controller. We calculate a quantitative measure of the controller's power and establish a lower bound on the control power required for controlled teleportation. We show that the maximally entangled GHZ state is a suitable channel for controlled teleportation of arbitrary single qubits - the controller's power meets the bound and the teleportation fidelity without the controller's permission is no better than the fidelity of a classical channel. We also construct partially entangled channels that exceed the bound for controlled teleportation of a restricted set of states called the equatorial states. We calculate the minimum entanglement required in these channels to exceed the bound. Moreover, we find that in these restricted controlled teleportation schemes, the partially entangled channels can outperform maximally entangled channels with respect to the controller's power. Our results provide a new perspective on controlled teleportation schemes and are of practical interest since we propose useful partially entangled channels.

Xi-Han Li; Shohini Ghose

2014-10-05T23:59:59.000Z

31

A boron nitride nanotube peapod thermal rectifier  

SciTech Connect (OSTI)

The precise guidance of heat from one specific location to another is paramount in many industrial and commercial applications, including thermal management and thermoelectric generation. One of the cardinal requirements is a preferential conduction of thermal energy, also known as thermal rectification, in the materials. This study introduces a novel nanomaterial for rectifying heatthe boron nitride nanotube peapod thermal rectifier. Classical non-equilibrium molecular dynamics simulations are performed on this nanomaterial, and interestingly, the strength of the rectification phenomenon is dissimilar at different operating temperatures. This is due to the contingence of the thermal flux on the conductance at the localized region around the scatterer, which varies with temperature. The rectification performance of the peapod rectifier is inherently dependent on its asymmetry. Last but not least, the favourable rectifying direction in the nanomaterial is established.

Loh, G. C., E-mail: jgloh@mtu.edu [Department of Physics, Michigan Technological University, Houghton, Michigan 49931 (United States); Institute of High Performance Computing, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632 (Singapore); Baillargeat, D. [CNRS-International-NTU-Thales Research Alliance (CINTRA), 50 Nanyang Drive, Singapore 637553 (Singapore)

2014-06-28T23:59:59.000Z

32

THE RECTIFIABILITY THRESHOLD IN ABELIAN GROUPS  

E-Print Network [OSTI]

.2]) that if G is a to* *rsion-free abelian group and t is a positive integer, then any finite subset of G is t-iso98 ] it is shown that any subset S of the cyclic group of prime order* * p with |S| log2tp is t-rectifiable, and an example of a subset with |S| 2 log* *tp + 1, which is not t-rectifiable, is presented. As a refinement

Lev, Vsevolod F.

33

Variable pressure power cycle and control system  

DOE Patents [OSTI]

A variable pressure power cycle and control system that is adjustable to a variable heat source is disclosed. The power cycle adjusts itself to the heat source so that a minimal temperature difference is maintained between the heat source fluid and the power cycle working fluid, thereby substantially matching the thermodynamic envelope of the power cycle to the thermodynamic envelope of the heat source. Adjustments are made by sensing the inlet temperature of the heat source fluid and then setting a superheated vapor temperature and pressure to achieve a minimum temperature difference between the heat source fluid and the working fluid.

Goldsberry, Fred L. (Spring, TX)

1984-11-27T23:59:59.000Z

34

Magnetic Amplifier for Power Flow Control  

SciTech Connect (OSTI)

GENI Project: ORNL is developing an electromagnet-based, amplifier-like device that will allow for complete control over the flow of power within the electric grid. To date, complete control of power flow within the grid has been prohibitively expensive. ORNLs controller could provide a reliable, cost-effective solution to this problem. The team is combining two types of pre-existing technologies to assist in flow control, culminating in a prototype iron-based magnetic amplifier. Ordinarily, such a device would require expensive superconductive wire, but the magnetic iron core of ORNLs device could serve as a low-cost alternative that is equally adept at regulating power flow.

None

2012-02-24T23:59:59.000Z

35

Modeling Combustion Control for High Power Diesel Mode Switching...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Combustion Control for High Power Diesel Mode Switching Modeling Combustion Control for High Power Diesel Mode Switching Poster presentation given at the 16th Directions in...

36

Power Flow Controller for Renewables: Transformer-less Unified Power Flow Controller for Wind and Solar Power Transmission  

SciTech Connect (OSTI)

GENI Project: MSU is developing a power flow controller to improve the routing of electricity from renewable sources through existing power lines. The fast, innovative, and lightweight circuitry that MSU is incorporating into its controller will eliminate the need for a separate heavy and expensive transformer, as well as the construction of new transmission lines. MSUs controller is better suited to control power flows from distributed and intermittent wind and solar power systems than traditional transformer-based controllers are, so it will help to integrate more renewable energy into the grid. MSUs power flow controller can be installed anywhere in the existing grid to optimize energy transmission and help reduce transmission congestion.

None

2012-02-08T23:59:59.000Z

37

622 IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 49, NO. 3, MARCH 2014 Co-Design of a CMOS Rectifier and Small Loop  

E-Print Network [OSTI]

622 IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 49, NO. 3, MARCH 2014 Co-Design of a CMOS Rectifier (EM) en- ergy into electrical DC power. This DC power is locally stored in a capacitor or battery

Serdijn, Wouter A.

38

MHD power plant instrumentation and control  

SciTech Connect (OSTI)

The Electric Power Research Institute (EPRI) has awarded a contract to the MHD Development Corporation (MDC) to develop instrumentation and control requirements and strategies for commercial MHD power plants. MDC subcontracted MSE to do the technical development required. MSE is being assisted by Montana State University (MSU) for the topping cycle development. A computer model of a stand-alone MHD/steam plant is being constructed. The plant is based on the plant design set forth in the MDC proposal to the Federal Clean Coal Technology 5 solicitation. It consists of an MHD topping plant, a Heat Recovery Seed Recovery (HRSR) plant, and a steam turbo-generator. The model is based on the computer code used for a study of the Corette plant retrofitted with an MHD plant. Additional control strategies, based on MHD testing results and current steam bottoming plant control data, will be incorporated. A model will be devised and implemented for automatic control of the plant. Requirements regarding instrumentation and actuators will be documented. Instrumentation and actuators that are not commercially available will be identified. The role and desired characteristics of an expert system in the automated control scheme is being investigated. Start-up and shutdown procedures will be studied and load change dynamic performance will be evaluated. System response to abnormal topping cycle and off-design system operation will be investigated. This includes use of MHD topping cycle models which couple gasdynamic and electrical behavior for the study of controlling of the MHD topping cycle. A curvefitter, which uses cubic Hermitian spline interpolation functions in as many as five dimensions, allows much more accurate reproduction of nonlinear, multidimensional functions. This project will be the first to investigate plant dynamics and control using as many as seven independent variables or control inputs to the MHD topping cycle.

Lofftus, D.; Rudberg, D. [MSE Inc., Butte, MT (United States); Johnson, R.; Hammerstrom, D. [Montana State Univ., Bozeman, MT (United States)

1993-12-31T23:59:59.000Z

39

Power System Frequency Control Characteristics as a Function of Nuclear Power Plant Participation  

Science Journals Connector (OSTI)

When the participation of nuclear power plants in electric power system increases then they have to be ... take an increasing part in the frequency and power control of the power system. However there are specifi...

Z. Domachowski

1988-01-01T23:59:59.000Z

40

Evaluation of SiC MOSFETs for a High Efficiency Three-Phase Buck Rectifier  

E-Print Network [OSTI]

-voltage DC (HVDC) distribution architecture in telecom and data centers was shown to have superior efficiency and reliability compared with the traditional AC architecture [1-2]. HVDC bus is usually set as 380 Vdc or 400 Vdc a high efficiency buck rectifier used in the first stage of HVDC architecture data center power supplies

Tolbert, Leon M.

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Modeling Combustion Control for High Power Diesel Mode Switching  

Broader source: Energy.gov (indexed) [DOE]

and Emissions Research Conference 2010 Modeling Combustion Control for High Power Diesel Mode Switching P-20 Motivation * High power LTC-diesel mode operation * Transient...

42

Rotary Shaft Power Extraction From a Free-Piston Engine  

Broader source: Energy.gov [DOE]

A mechanical rectifier using modern high-performance mechanical diodes can improve direct rotary shaft power output.

43

Intelligent Voltage and Reactive Power Control of Mini-Hydro Power Stations for Maximisation of Real  

E-Print Network [OSTI]

of a Mini-Hydro Power Generator to the Rural Grid The UK distribution network has been significantly exten1 Intelligent Voltage and Reactive Power Control of Mini-Hydro Power Stations for Maximisation Control (APFC) modes. The ability to export active and reactive power from mini-hydro power generators

Harrison, Gareth

44

Adaptive Power Control for Single and Multiuser Opportunistic Systems  

E-Print Network [OSTI]

In this dissertation, adaptive power control for single and multiuser opportunistic systems is investigated. First, a new adaptive power-controlled diversity combining scheme for single user systems is proposed, upon which is extended...

Nam, Sung Sik

2010-07-14T23:59:59.000Z

45

Auxiliary power controls on the Nelson River HVDC scheme  

SciTech Connect (OSTI)

This paper describes the auxiliary power controls on the Nelson River HVDC scheme. It shows how the fast control feature of the HVDC link can be utilized to enhance the operation of an integrated ac/dc power system.

Chand, J. (Manitoba Hydro, Winnipeg, Manitoba (CA))

1992-02-01T23:59:59.000Z

46

Energy Efficient Scheduling with Power Control for Wireless Networks  

E-Print Network [OSTI]

Energy Efficient Scheduling with Power Control for Wireless Networks Bastian Katz Institute the complexity of scheduling with power control in the SINRG model of interference. Based on a novel scheme) and less energy consumption: power control admits schedules that would otherwise violate interference

Paris-Sud XI, Université de

47

Hybrid Modeling and Control of a Hydroelectric Power Plant  

E-Print Network [OSTI]

Hybrid Modeling and Control of a Hydroelectric Power Plant Giancarlo Ferrari-Trecate, Domenico,mignone,castagnoli,morari}@aut.ee.ethz.ch Abstract In this work we present the model of a hydroelectric power plant in the framework of Mixed Logic with a model predictive control scheme. 1 Introduction The outflow control for hydroelectric power plants

Ferrari-Trecate, Giancarlo

48

Wax and hydrate control with electrical power  

SciTech Connect (OSTI)

Electrical heating of subsea flowlines is an effective way to prevent wax and hydrate information, especially for long transportation distances and in low-temperature deep water. Systems are available for use in conjunction with bundles, pipe-in-pipe, and wet-thermal-insulation systems. These systems provide environmentally friendly fluid-temperature control without chemicals or flaring for pipeline depressurizing. Enhanced production is achieved because no time is lost by unnecessary depressurizing, pigging, heating-medium circulation, or removal of hydrate and wax blockages. The seabed temperature at 100-m and greater water depths may range from 7 to {minus}1.5 C, causing a rapid cooling of the hot well streams being transported in subsea flowlines. Under these supercooling conditions, vulnerable crude oils and multiphase compositions will deposit wax and asphalts; also the gas/water phase may freeze solid with hydrate particles. The paper discusses thermal-insulated flowlines, heat-loss compensation with electrical power, electrical power consumption and operation, and subsea electrical-power distribution system.

NONE

1997-08-01T23:59:59.000Z

49

Digitally Controlled High Availability Power Supply  

SciTech Connect (OSTI)

This paper will report on the test results of a prototype 1320 watt power module for a high availability power supply. The module will allow parallel operation for N+1 redundancy with hot swap capability. The two quadrant output of each module allows pairs of modules to provide a 4 quadrant (bipolar) operation. Each module employs a novel 4 FET buck regulator arranged in a bridge configuration. Each side of the bridge alternately conducts through a small saturable ferrite that limits the reverse current in the FET body diode during turn off. This allows hard switching of the FETs with low switching losses. The module is designed with over-rated components to provide high reliability and better then 97% efficiency at full load. The modules use a Microchip DSP for control, monitoring, and fault detection. The switching FETS are driven by PWM modules in the DSP at 60 KHz. A Dual CAN bus interface provides for low cost redundant control paths. The DSP will also provide current sharing between modules, synchronized switching, and soft start up for hot swapping. The input and output of each module have low resistance FETs to allow hot swapping and isolation of faulted units.

MacNair, David; /SLAC

2009-05-07T23:59:59.000Z

50

(Nuclear power plant control and instrumentation technology)  

SciTech Connect (OSTI)

While on vacation, the traveler attended the European Nuclear Conference in Lyon, France. This trip was part of an outside activity approved by DOE. The traveler is a consultant to Loyola College, serving as chairman of a panel to assess the state of the art in the controls and instrumentation technology in the European nuclear community. This study is being conducted by Loyola College under subcontract to the National Science Foundation. The traveler was surprised by the level of automation claimed (by the company Siemens AG KWU) to be present in the German Konvoi nuclear power plants. The claim was that this was done to improve the safety of the plant by keeping the operator out of the loop'' for the first 30 minutes of some transients or accidents.

White, J.D.

1990-10-10T23:59:59.000Z

51

Aerospace Power & Electronics Simulation Workshop 2004 Satellite Attitude Control  

E-Print Network [OSTI]

Aerospace Power & Electronics Simulation Workshop 2004 · Satellite Attitude Control System Design Using Reaction Wheels Bhanu Gouda Brian Fast Dan Simon #12;2Aerospace Power & Electronics Simulation;3Aerospace Power & Electronics Simulation Workshop 2004 ADCS ·ADCS: Attitude Determination and Control

Simon, Dan

52

Control of Wind Turbines for Power Regulation and  

E-Print Network [OSTI]

Control of Wind Turbines for Power Regulation and Load Reduction Juan Jose Garcia Quirante Kongens regulation and load reduction and their ensemble in a variable-speed wind turbine. The power regulation aspects of mathematical modelling of wind turbines, and especially the control methods suited for power

53

Electric Power Controller for Steering Wheel Management in Electric Cars  

E-Print Network [OSTI]

Electric Power Controller for Steering Wheel Management in Electric Cars Vicente Milanés, Joshué-- Autonomous vehicles, Power control, System analysis and design, Intelligent transportation systems. I they are named hydraulic power steering (HPS) systems. If an electric motor is used then they are named electric

Paris-Sud XI, Université de

54

Transient power control in dynamic positioning -governor feedforward and  

E-Print Network [OSTI]

other large power con- sumers are installed on a particular vessel. A diesel-driven power plant operatesTransient power control in dynamic positioning - governor feedforward and dynamic thrust allocation-mail: skjetne@ieee.org) Abstract: A thrust allocation algorithm with capability to assist the power management

Johansen, Tor Arne

55

Power and Voltage Smooth Control of Doubly Fed Induction Generator  

Science Journals Connector (OSTI)

Doubly-fed induction generator (DFIG) is the leading in wind power technology currently. In this paper, decoupling control of DFIG is studied and a new energy storage device is used in the smooth control of DFIG system's power and voltage. This new method ... Keywords: Doubly fed induction generator, Energy storage device, Decoupling control

An-Ren Ma; Cai-Xia Wang; Zhi-Wen Zhou; Tao Wu

2012-07-01T23:59:59.000Z

56

Power Conditioning and Control Applications for Energy Conservation  

E-Print Network [OSTI]

Electrical power conditioning and control (PCC) systems are finding cost effective applications in AC motor drives, lamp ballasts and power supplies. Substantial system efficiency improvements are being realized when the appropriate PCC system...

Brushwood, J. S.

1982-01-01T23:59:59.000Z

57

Control of Power Grid Development: Numerical Solutions  

Science Journals Connector (OSTI)

Consideration was given to the problem of determining the long-term strategies of commissioning and removing the power equipment of a power system. The problem was described in terms of the integral Volterra equa...

D. V. Ivanov; I. V. Karaulova; E. V. Markova

2004-03-01T23:59:59.000Z

58

Improving waveform quality in direct power control of DFIG using fuzzy controller  

Science Journals Connector (OSTI)

This paper proposes a new direct power control (DPC) strategy of double-fed induction generator using fuzzy logic controller. The active and reactive power equations are expanded, and effects of voltage vecto...

H. Z. Boroujeni; M. F. Othman; A. H. Shirdel

2014-11-01T23:59:59.000Z

59

Optimal Voltage Control of the Southern Norwegian Power Grid.  

E-Print Network [OSTI]

??This thesis contains the synthesis, analysis and simulation results of an automatic optimal voltage controller for the Southern Norwegian power grid. Currently the high voltage (more)

Hannisdal, Erik Lundegaard

2011-01-01T23:59:59.000Z

60

Enforcement Letter, Controlled Power Company - WEL-2012-02 |...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Company - WEL-2012-02 October 23, 2012 Issued to Controlled Power Company related to an Electrical Shock Near Miss that occurred in the Radiological Laboratory Utility Office...

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Dynamic Power Flow Controller: Compact Dynamic Phase Angle Regulators for Transmission Power Routing  

SciTech Connect (OSTI)

GENI Project: Varentec is developing compact, low-cost transmission power controllers with fractional power rating for controlling power flow on transmission networks. The technology will enhance grid operations through improved use of current assets and by dramatically reducing the number of transmission lines that have to be built to meet increasing contributions of renewable energy sources like wind and solar. The proposed transmission controllers would allow for the dynamic control of voltage and power flow, improving the grids ability to dispatch power in real time to the places where it is most needed. The controllers would work as fail-safe devices whereby the grid would be restored to its present operating state in the event of a controller malfunction instead of failing outright. The ability to affordably and dynamically control power flow with adequate fail-safe switchgear could open up new competitive energy markets which are not possible under the current regulatory structure and technology base.

None

2012-01-03T23:59:59.000Z

62

Research on Control System of High Power DFIG Wind Power System  

Science Journals Connector (OSTI)

Compared with constant speed constant frequency wind turbine, variable speed constant frequency wind turbine has many advantages: higher efficiency of wind energy converting to electric power, absorbing gust energy, smoothly cutting into the network ... Keywords: wind power, DFIG, high power, LQR, variable speed constant frequency, constant power control

Li Jianlin; Xu Honghua

2008-12-01T23:59:59.000Z

63

Control system for the prototype of hydrogen powered car  

Science Journals Connector (OSTI)

The contribution describes design and construction of hydrogen powered car based on fuel cell technology and electrical DC-drive. The main focus is given to control system and human machine interface of the car. The practical solution of control system ... Keywords: control system design, fuel cells, human machine interface, hydrogen, programmable controllers

Jiri Koziorek; Zdenek Slanina

2005-11-01T23:59:59.000Z

64

The Rectified Second Law of Thermodynamics  

Science Journals Connector (OSTI)

The general form of the rectified second law is further applied to a broad class of quasi-static irreverisble (QSI) processes, for which all of the thermodynamic functions of both the system and surroundings remain continuously well-defined, thus facilitating excess entropy measurements by integrating exact differential functions along QSI paths. ... It is instructive to recall that the discovery of this profound principle of nature originally emerged from the practical concerns of nineteenth century industrialists who desired to increase the efficiency of steam engines.1 Although the second law of thermodynamics may be stated in a myriad of ways, in the Introduction to his famous paper On the Equilibrium of Heterogeneous Substances2 Gibbs quoted Clausius' remarkably concise statement of the first and second laws of thermodynamics (as translated from German): ...

Dor Ben-Amotz; J. M. Honig

2006-07-14T23:59:59.000Z

65

Centralized wind power plant voltage control with optimal power flow algorithm.  

E-Print Network [OSTI]

??This thesis presents a method of controlling the reactive power injected into a medium-voltage collection system by multiple wind turbine generators such that the voltage (more)

Kline, Jared Andrew

2011-01-01T23:59:59.000Z

66

Control of Power Grid Development: Numerical Solutions  

Science Journals Connector (OSTI)

Consideration was given to the problem of determining the long-term strategies of commissioning and removing the power equipment of a power system. The problem was described in terms of the integral Volterra equations of the first kind. An algorithm ...

D. V. Ivanov; I. V. Karaulova; E. V. Markova; V. V. Trufanov; O. V. Khamisov

2004-03-01T23:59:59.000Z

67

Advanced Power Systems and Controls Laboratory  

E-Print Network [OSTI]

photovoltaic generation facility. Solar panel output is in white, and the response of the XP DPR is in red Solar Power Generation Introduction The rapid growth of wind and solar power is a key driver of the development of grid-scale Battery Energy Storage Systems (BESS). A well implemented BESS co-located with solar

Ben-Yakar, Adela

68

Security and stability control system for offshore platforms power grid  

Science Journals Connector (OSTI)

The key technology for offshore platform power grid interlinked-Energy Management System (EMS) is studied in this article. The perfect EMS control solutions are formulated and carried on by the studies of the control strategies of frequency control, voltage control, precedence load shedding, high frequency trip generator, communication failure, and so on according to the power flow and fault simulation calculations against all kinds of working modes of the grid. The power supply effects before and after using the power grid interlink and EMS control are contrasted. Their application has improved the power supply reliability, boosted up the ability against impacts, decreased the spare capability of generators, reduced the maintenance work, and saved the investment.

Zhang Jifen; Hu Peng; Liu Jun

2009-01-01T23:59:59.000Z

69

Bi-directional power control system for voltage converter  

DOE Patents [OSTI]

A control system for a voltage converter includes: a power comparator for comparing a power signal on input terminals of the converter with a commanded power signal and producing a power comparison signal; a power regulator for transforming the power comparison signal to a commanded current signal; a current comparator for comparing the commanded current signal with a measured current signal on output terminals of the converter and producing a current comparison signal; a current regulator for transforming the current comparison signal to a pulse width modulator (PWM) duty cycle command signal; and a PWM for using the PWM duty cycle command signal to control electrical switches of the converter. The control system may further include: a command multiplier for converting a voltage signal across the output terminals of the converter to a gain signal having a value between zero (0) and unity (1), and a power multiplier for multiplying the commanded power signal by the gain signal to provide a limited commanded power signal, wherein power comparator compares the limited commanded power signal with the power signal on the input terminals.

Garrigan, Neil Richard (Niskayuna, NY); King, Robert Dean (Schenectady, NY); Schwartz, James Edward (Slingerlands, NY)

1999-01-01T23:59:59.000Z

70

Power Control and Transmission Scheduling for Network Utility Maximization in Wireless Networks  

E-Print Network [OSTI]

Power Control and Transmission Scheduling for Network Utility Maximization in Wireless Networks Min power control and transmis- sion scheduling problem in wireless networks with average power constraints. Index Terms--Network utility maximization, power control, transmission scheduling, column generation I

Sharma, Vinod

71

Next Generation Power Electronics National Manufacturing Innovation...  

Energy Savers [EERE]

components of modern data center systems. WBG chips will eliminate up to 90% of the energy losses in today's rectifiers that perform these conversions. WBG-based power...

72

Catalog of DC Appliances and Power Systems  

E-Print Network [OSTI]

en.wikipedia.org/wiki/Variable-frequency_drive. Garbesi,are generally powered by variable frequency drives.The typical variable frequency drive first rectifies the AC

Garbesi, Karina

2012-01-01T23:59:59.000Z

73

Integrated power unit control apparatus and method  

SciTech Connect (OSTI)

This patent describes control apparatus for a dual mode turbine engine, the turbine engine including a dynamic compressor supplying pressurized air to a combustor of the engine, and a storage source of pressurized air selectively flowing to the combustor via an air control valve; the control apparatus. It comprises: air flow control means receiving a signal CIP indicative of the pressure level of pressurized air at the combustor and in response thereto providing to the air control valve/a command signal Air/Fuel COMM indicative of a mass flow rate of air to be provided to the combustor from the storage source; and fuel control means receiving the Air/Fuel COMM signal and in response thereto providing a signal W{sub F} indicative of the weight of fuel per unit time to be provided to the combustor.

Klaass, R.M.; Minshall, B.J.; Suriano, F.J.; Caan, W.

1992-03-24T23:59:59.000Z

74

Mercury Control Demonstration Projects Cover Photos: * Top: Limestone Power Plant  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

6 FEBRUARY 2008 6 FEBRUARY 2008 Mercury Control Demonstration Projects Cover Photos: * Top: Limestone Power Plant * Bottom left: AES Greenidge Power Plant * Bottom right: Presque Isle Power Plant A report on three projects conducted under separate cooperative agreements between the U.S. Department of Energy and: * Consol Energy * Pegasus Technologies * We Energies  Mercury Control Demonstration Projects Executive Summary ............................................................................ 4 Background ......................................................................................... 5 Mercury Removal Projects ................................................................ 7 TOXECON(tm) Retrofit For Mercury and Multi-Pollutant Control on Three 90-MW Coal-Fired Boilers ........................................7

75

Adaptive excitation control in power systems  

E-Print Network [OSTI]

control input pu? and output gE? , we have puBxAx ?+?=? ? (2.25) xig ? (2.26) where ?? ? ?? ? ?== 6667 2 rJA , ?? ? ?? ?= 67 0 iB , [ ]08213.1=C 32....38) or puBxAx ?+?=? ? (2.39) xip ? (2.40) where p is a measurable output and iii C are uncertain system parameters. In the Chapter IV, we apply our adaptive control approaches to the real DAE system. We...

Chiu, Pei-Chen

2006-08-16T23:59:59.000Z

76

Precision envelope detector and linear rectifier circuitry  

DOE Patents [OSTI]

Disclosed is a method and apparatus for the precise linear rectification and envelope detection of oscillatory signals. The signal is applied to a voltage-to-current converter which supplies current to a constant current sink. The connection between the converter and the sink is also applied through a diode and an output load resistor to a ground connection. The connection is also connected to ground through a second diode of opposite polarity from the diode in series with the load resistor. Very small amplitude voltage signals applied to the converter will cause a small change in the output current of the converter, and the difference between the output current and the constant current sink will be applied either directly to ground through the single diode, or across the output load resistor, dependent upon the polarity. Disclosed also is a full-wave rectifier utilizing constant current sinks and voltage-to-current converters. Additionally, disclosed is a combination of the voltage-to-current converters with differential integrated circuit preamplifiers to boost the initial signal amplitude, and with low pass filtering applied so as to obtain a video or signal envelope output.

Davis, Thomas J. (Richland, WA)

1980-01-01T23:59:59.000Z

77

Cyber vulnerability in power systems operation and control  

Science Journals Connector (OSTI)

Modern power systems are composed of several interacting national systems synchronously or asynchronously interconnected over large geographic areas, and in the European case on a continental basis. In each country several areas are put under the control ...

Ettore Bompard; Paolo Cuccia; Marcelo Masera; Igor Nai Fovino

2012-01-01T23:59:59.000Z

78

Wind Power Control System Associated to the Flywheel Energy Storage System Connected to the Grid  

Science Journals Connector (OSTI)

Abstract The aim of this work is the study of the integration of the flywheel energy storage systems in the wind generators at variable speed based to the doubly fed induction generator (DFIG) and to help these generators to contribute to the ancillary services. In this paper investigates also, the control method of the flywheel energy storage system (FESS) with a classical squirrel-cage induction machine associated to a variable speed wind generation using cascade rectifier filter inverter. Simulation results of the dynamic models of the wind generator are presented, for different operating points, to show the good performance of the proposed system.

S. Taraft; D. Rekioua; D. Aouzellag

2013-01-01T23:59:59.000Z

79

Incremental Design of a Power Transformer Station Controller using a  

E-Print Network [OSTI]

by a polynomial and then by a Ternary Decision Diagram (TDD), a slight extension of the Binary Decision Diagrams of the controller is to handle the power interruption, the redirection of supply sources, and the reestablishment of the power following an interruption. The objective is twofold: the safety of material and the best

Paris-Sud XI, Université de

80

Ris-R-1118(EN) Power Control for Wind Tur-  

E-Print Network [OSTI]

to increase the wind energy penetration. The main options are to combine wind power with a pumped hydro power been developed to assess that. The economic investigations have shown that for small systems where only small amounts of wind energy would otherwise have been dumped add-on PQ- controllers with battery

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Interleaved power converter  

DOE Patents [OSTI]

A power converter architecture interleaves full bridge converters to alleviate thermal management problems in high current applications, and may, for example, double the output power capability while reducing parts count and costs. For example, one phase of a three phase inverter is shared between two transformers, which provide power to a rectifier such as a current doubler rectifier to provide two full bridge DC/DC converters with three rather than four high voltage inverter legs.

Zhu, Lizhi (Canton, MI)

2007-11-13T23:59:59.000Z

82

Electrical power distribution control methods, electrical energy demand monitoring methods, and power management devices  

DOE Patents [OSTI]

Electrical power distribution control methods, electrical energy demand monitoring methods, and power management devices are described. In one aspect, an electrical power distribution control method includes providing electrical energy from an electrical power distribution system, applying the electrical energy to a load, providing a plurality of different values for a threshold at a plurality of moments in time and corresponding to an electrical characteristic of the electrical energy, and adjusting an amount of the electrical energy applied to the load responsive to an electrical characteristic of the electrical energy triggering one of the values of the threshold at the respective moment in time.

Chassin, David P. (Pasco, WA); Donnelly, Matthew K. (Kennewick, WA); Dagle, Jeffery E. (Richland, WA)

2006-12-12T23:59:59.000Z

83

Model Predictive Control of Integrated Gasification Combined Cycle Power Plants  

SciTech Connect (OSTI)

The primary project objectives were to understand how the process design of an integrated gasification combined cycle (IGCC) power plant affects the dynamic operability and controllability of the process. Steady-state and dynamic simulation models were developed to predict the process behavior during typical transients that occur in plant operation. Advanced control strategies were developed to improve the ability of the process to follow changes in the power load demand, and to improve performance during transitions between power levels. Another objective of the proposed work was to educate graduate and undergraduate students in the application of process systems and control to coal technology. Educational materials were developed for use in engineering courses to further broaden this exposure to many students. ASPENTECH software was used to perform steady-state and dynamic simulations of an IGCC power plant. Linear systems analysis techniques were used to assess the steady-state and dynamic operability of the power plant under various plant operating conditions. Model predictive control (MPC) strategies were developed to improve the dynamic operation of the power plants. MATLAB and SIMULINK software were used for systems analysis and control system design, and the SIMULINK functionality in ASPEN DYNAMICS was used to test the control strategies on the simulated process. Project funds were used to support a Ph.D. student to receive education and training in coal technology and the application of modeling and simulation techniques.

B. Wayne Bequette; Priyadarshi Mahapatra

2010-08-31T23:59:59.000Z

84

Local Control of Reactive Power by Distributed Photovoltaic Generators  

E-Print Network [OSTI]

High penetration levels of distributed photovoltaic (PV) generation on an electrical distribution circuit may severely degrade power quality due to voltage sags and swells caused by rapidly varying PV generation during cloud transients coupled with the slow response of existing utility compensation and regulation equipment. Although not permitted under current standards for interconnection of distributed generation, fast-reacting, VAR-capable PV inverters may provide the necessary reactive power injection or consumption to maintain voltage regulation under difficult transient conditions. As side benefit, the control of reactive power injection at each PV inverter provides an opportunity and a new tool for distribution utilities to optimize the performance of distribution circuits, e.g. by minimizing thermal losses. We suggest a local control scheme that dispatches reactive power from each PV inverter based on local instantaneous measurements of the real and reactive components of the consumed power and the re...

Turitsyn, Konstantin S; Backhaus, Scott; Chertkov, Misha

2010-01-01T23:59:59.000Z

85

Maximum power tracking control scheme for wind generator systems  

E-Print Network [OSTI]

The purpose of this work is to develop a maximum power tracking control strategy for variable speed wind turbine systems. Modern wind turbine control systems are slow, and they depend on the design parameters of the turbine and use wind and/or rotor...

Mena, Hugo Eduardo

2009-05-15T23:59:59.000Z

86

Maximum power tracking control scheme for wind generator systems  

E-Print Network [OSTI]

The purpose of this work is to develop a maximum power tracking control strategy for variable speed wind turbine systems. Modern wind turbine control systems are slow, and they depend on the design parameters of the turbine and use wind and/or rotor...

Mena Lopez, Hugo Eduardo

2008-10-10T23:59:59.000Z

87

Green Scheduling: Scheduling of Control Systems for Peak Power Reduction  

E-Print Network [OSTI]

approach to fine-grained coordination of energy demand by scheduling energy consuming control systems of the system variables only, control system execution (i.e. when energy is supplied to the system-Scheduling; Energy Systems; Peak Power Reduction; Load Balancing; I. INTRODUCTION During a major sporting event

Pappas, George J.

88

Controllers with Minimal Observation Power (Application to Timed Systems)  

E-Print Network [OSTI]

Controllers with Minimal Observation Power (Application to Timed Systems) Peter Bulychev1 , Franck is the computation of a subset of predicates sufficient for control and whose cost is minimal. Our solution avoids, Danish-Chinese Center for Cyber Physical Systems (IDEA4CPS) and VKR Center of Excellence MT-LAB. #12;The

David, Alexandre

89

Upgrading the TFTR Transrex Power Supplies  

SciTech Connect (OSTI)

In order to provide improved and expanded experimental capabilities, the existing Transrex power supplies at PPPL are to be upgraded and modernized. Each of the 39 power supplies consists of two six pulse silicon controlled rectifier sections forming a twelve pulse power supply. The first modification is to split each supply into two independent six pulse supplies by replacing the existing obsolete twelve pulse firing generator with two commercially available six pulse firing generators. The second change replaces the existing control link with a faster system, with greater capacity, which will allow for independent control of all 78 power supply sections. The third change replaces the existing Computer Automated Measurement and Control (CAMAC) based fault detector with an Experimental Physics and Industrial Control System (EPICS) compatible unit, eliminating the obsolete CAMAC modules. Finally the remaining relay logic and interfaces to the "Hardwired Control System" will be replaces with a Programmable Logic Controller (PLC).

J. E. Lawson, R. Marsala, S. Ramakrishnan, X. Zhao, P. Sichta

2009-05-29T23:59:59.000Z

90

Power Quality/Harmonic Detection: Harmonic Control in Electric Power Systems for the Telecommunications Industry  

E-Print Network [OSTI]

The control of harmonics in power systems continues to be a major concern in the telecommunications industry. AC/DC telecommunication conversion equipment has rarely been thought of as playing a major role in the harmonic interaction problem. Yet...

Felkner, L. J.; Waggoner, R. M.

91

Fuzzy Control on Voltage/Reactive Power in Electric Power Substation  

Science Journals Connector (OSTI)

A fuzzy method using in voltage and reactive power control in electric substation is proposed based on the improved 17 ... times at the tap positions of transformers in substation are much less than usual. So,...

Xiu-hua Wu; Jun-cheng Wang; Ping Yang

2009-01-01T23:59:59.000Z

92

Power control system for a hot gas engine  

DOE Patents [OSTI]

A power control system for a hot gas engine of the type in which the power output is controlled by varying the mean pressure of the working gas charge in the engine has according to the present invention been provided with two working gas reservoirs at substantially different pressure levels. At working gas pressures below the lower of said levels the high pressure gas reservoir is cut out from the control system, and at higher pressures the low pressure gas reservoir is cut out from the system, thereby enabling a single one-stage compressor to handle gas within a wide pressure range at a low compression ratio.

Berntell, John O. (Staffanstorp, SE)

1986-01-01T23:59:59.000Z

93

Local control of reactive power by distributed photovoltaic generators  

SciTech Connect (OSTI)

High penetration levels of distributed photovoltaic (PV) generation on an electrical distribution circuit may severely degrade power quality due to voltage sags and swells caused by rapidly varying PV generation during cloud transients coupled with the slow response of existing utility compensation and regulation equipment. Although not permitted under current standards for interconnection of distributed generation, fast-reacting, VAR-capable PV inverters may provide the necessary reactive power injection or consumption to maintain voltage regulation under difficult transient conditions. As side benefit, the control of reactive power injection at each PV inverter provides an opportunity and a new tool for distribution utilities to optimize the performance of distribution circuits, e.g. by minimizing thermal losses. We suggest a local control scheme that dispatches reactive power from each PV inverter based on local instantaneous measurements of the real and reactive components of the consumed power and the real power generated by the PVs. Using one adjustable parameter per circuit, we balance the requirements on power quality and desire to minimize thermal losses. Numerical analysis of two exemplary systems, with comparable total PV generation albeit a different spatial distribution, show how to adjust the optimization parameter depending on the goal. Overall, this local scheme shows excellent performance; it's capable of guaranteeing acceptable power quality and achieving significant saving in thermal losses in various situations even when the renewable generation in excess of the circuit own load, i.e. feeding power back to the higher-level system.

Chertkov, Michael [Los Alamos National Laboratory; Turitsyn, Konstantin [Los Alamos National Laboratory; Sulc, Petr [Los Alamos National Laboratory; Backhaus, Scott [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

94

Photovoltaic Powering And Control System For Electrochromic Windows  

DOE Patents [OSTI]

A sealed insulated glass unit is provided with an electrochromic device for modulating light passing through the unit. The electrochromic device is controlled from outside the unit by a remote control electrically unconnected to the device. Circuitry within the unit may be magnetically controlled from outside. The electrochromic device is powered by a photovoltaic cells. The photovoltaic cells may be positioned so that at least a part of the light incident on the cell passes through the electrochromic device, providing a form of feedback control. A variable resistance placed in parallel with the electrochromic element is used to control the response of the electrochromic element to changes in output of the photovoltaic cell.

Schulz, Stephen C. (Tewksbury, MA); Michalski, Lech A. (Pennington, NJ); Volltrauer, Hermann N. (Englishtown, NJ); Van Dine, John E. (Faribault, MN)

2000-04-25T23:59:59.000Z

95

Options for Control of Reactive Power by Distributed Photovoltaic Generators  

E-Print Network [OSTI]

High penetration levels of distributed photovoltaic(PV) generation on an electrical distribution circuit present several challenges and opportunities for distribution utilities. Rapidly varying irradiance conditions may cause voltage sags and swells that cannot be compensated by slowly responding utility equipment resulting in a degradation of power quality. Although not permitted under current standards for interconnection of distributed generation, fast-reacting, VAR-capable PV inverters may provide the necessary reactive power injection or consumption to maintain voltage regulation under difficult transient conditions. As side benefit, the control of reactive power injection at each PV inverter provides an opportunity and a new tool for distribution utilities to optimize the performance of distribution circuits, e.g. by minimizing thermal losses. We discuss and compare via simulation various design options for control systems to manage the reactive power generated by these inverters. An important design de...

Sulc, Petr; Backhaus, Scott; Chertkov, Michael

2010-01-01T23:59:59.000Z

96

Effects of intentional threats to power substation control systems  

Science Journals Connector (OSTI)

Power station control and management systems represent key elements for guaranteeing the security of the power grid infrastructure. Intrinsically conceived to support the continuous provision of power in secure conditions, those systems today make intensive use of information and communication systems and are therefore exposed to related accidental and intentional cyber threats. This paper describes a simulation of cyber attacks conducted in the CESI RICERCA laboratory testbed on a prototypical substation control infrastructure with the purpose of testing their feasibility and illustrating their impact on the control system services. A set of attack scenarios targeting several subsystems has been experimented, with different simulated threat motivations and different degrees of impact on the global substation service. The paper reports some considerations about the consequences of the implemented attacks, focusing on different facets of the problem, in an effort to elucidate the full significance of the potential cyber threats.

Giovanna Dondossola; Judit Szanto; Marcelo Masera; Igor Nai Fovino

2008-01-01T23:59:59.000Z

97

Reference Model for Control and Automation Systems in Electrical Power |  

Broader source: Energy.gov (indexed) [DOE]

Model for Control and Automation Systems in Electrical Model for Control and Automation Systems in Electrical Power Reference Model for Control and Automation Systems in Electrical Power Modern infrastructure automation systems are threatened by cyber attack. Their higher visibility in recent years and the increasing use of modern information technology (IT) components contribute to increased security risk. A means of analyzing these infrastructure automation systems is needed to help understand and study the many system relationships that affect the overall security of the system. Modeling these systems is a very cost effective means of addressing the problem of security from an overall system view. The model presented in the document below provides a structured, cost effective approach to address technical security in process control systems

98

Enhanced IGCC regulatory control and coordinated plant-wide control strategies for improving power ramp rates  

SciTech Connect (OSTI)

As part of ongoing R&D activities at the National Energy Technology Laboratorys (NETL) Advanced Virtual Energy Simulation Training & Research (AVESTAR) Center, this paper highlights strategies for enhancing low-level regulatory control and system-wide coordinated control strategies implemented in a high-fidelity dynamic simulator for an Integrated Gasification Combined Cycle (IGCC) power plant with carbon capture. The underlying IGCC plant dynamic model contains 20 major process areas, each of which is tightly integrated with the rest of the power plant, making individual functionally-independent processes prone to routine disturbances. Single-loop feedback control although adequate to meet the primary control objective for most processes, does not take into account in advance the effect of these disturbances, making the entire power plant undergo large offshoots and/or oscillations before the feedback action has an opportunity to impact control performance. In this paper, controller enhancements ranging from retuning feedback control loops, multiplicative feed-forward control and other control techniques such as split-range control, feedback trim and dynamic compensation, applicable on various subsections of the integrated IGCC plant, have been highlighted and improvements in control responses have been given. Compared to using classical feedback-based control structure, the enhanced IGCC regulatory control architecture reduces plant settling time and peak offshoots, achieves faster disturbance rejection, and promotes higher power ramp-rates. In addition, improvements in IGCC coordinated plant-wide control strategies for Gasifier-Lead, GT-Lead and Plantwide operation modes have been proposed and their responses compared. The paper is concluded with a brief discussion on the potential IGCC controller improvements resulting from using advanced process control, including model predictive control (MPC), as a supervisory control layer.

Mahapatra, P.; Zitney, S.

2012-01-01T23:59:59.000Z

99

Computer controlled MHD power consolidation and pulse generation system  

SciTech Connect (OSTI)

The major goal of this research project is to establish the feasibility of a power conversion technology which will permit the direct synthesis of computer programmable pulse power. Feasibility has been established in this project by demonstration of direct synthesis of commercial frequency power by means of computer control. The power input to the conversion system is assumed to be a Faraday connected MHD generator which may be viewed as a multi-terminal dc source and is simulated for the purpose of this demonstration by a set of dc power supplies. This consolidation/inversion (CI), process will be referred to subsequently as Pulse Amplitude Synthesis and Control (PASC). A secondary goal is to deliver a controller subsystem consisting of a computer, software, and computer interface board which can serve as one of the building blocks for a possible phase II prototype system. This report period work summarizes the accomplishments and covers the high points of the two year project. 6 refs., 41 figs.

Johnson, R.; Marcotte, K.; Donnelly, M.

1990-01-01T23:59:59.000Z

100

E-Print Network 3.0 - activating delayed rectifier Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: itself. The concept of active damping for the current-source rectifier is not new. However, most research... of 3.65-6.09 pu. Active damping uses the rectifier to...

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

PowerMatcher: multiagent control in the electricity infrastructure  

Science Journals Connector (OSTI)

Different driving forces push the electricity production towards decentralization. As a result, the current electricity infrastructure is expected to evolve into a network of networks, in which all system parts communicate with each other and influence ... Keywords: electrical power systems automation, electricity infrastructure, electronic markets, multi-agent control, multi-agent systems

J. K. Kok; C. J. Warmer; I. G. Kamphuis

2005-07-01T23:59:59.000Z

102

A Full-Wave Rectifier for Interfacing with Multi-Phase Piezoelectric Energy Harvesters*  

E-Print Network [OSTI]

A Full-Wave Rectifier for Interfacing with Multi-Phase Piezoelectric Energy Harvesters* N. J: TECHNOLOGY TRENDS: Energy Sources and Energy Harvesting Abstract A full-wave rectifier has been fabricated, AND HURST 1 A Full-Wave Rectifier for Interfacing with Multi-Phase Piezoelectric Energy Harvesters* N. J

Hurst, Paul J.

103

18-IGBT PWM-VSIThree-leg Boost LCL-filterRectifier 500 kW 21-IGBT-based frequency converter  

E-Print Network [OSTI]

for 35 years, proving that a well- constructed wind turbine is a sustainable approach to renewable energy-speed wind power systems, have been introduced [1-5] and while a fair amount of them had a great impact3 phase AC Grid 18-IGBT PWM-VSIThree-leg Boost LCL-filterRectifier SG 500 kW 21-IGBT

Berning, Torsten

104

Control system and method for a universal power conditioning system  

SciTech Connect (OSTI)

A new current loop control system method is proposed for a single-phase grid-tie power conditioning system that can be used under a standalone or a grid-tie mode. This type of inverter utilizes an inductor-capacitor-inductor (LCL) filter as the interface in between inverter and the utility grid. The first set of inductor-capacitor (LC) can be used in the standalone mode, and the complete LCL can be used for the grid-tie mode. A new admittance compensation technique is proposed for the controller design to avoid low stability margin while maintaining sufficient gain at the fundamental frequency. The proposed current loop controller system and admittance compensation technique have been simulated and tested. Simulation results indicate that without the admittance path compensation, the current loop controller output duty cycle is largely offset by an undesired admittance path. At the initial simulation cycle, the power flow may be erratically fed back to the inverter causing catastrophic failure. With admittance path compensation, the output power shows a steady-state offset that matches the design value. Experimental results show that the inverter is capable of both a standalone and a grid-tie connection mode using the LCL filter configuration.

Lai, Jih-Sheng; Park, Sung Yeul; Chen, Chien-Liang

2014-09-02T23:59:59.000Z

105

NREL: Wind Research - NREL and EPRI Actively Embrace Active Power Control  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and EPRI Actively Embrace Active Power Control Systems for Wind Power and EPRI Actively Embrace Active Power Control Systems for Wind Power December 2, 2013 The Second Workshop on Active Power Control (APC) cohosted by the National Renewable Energy Laboratory (NREL) and the Electric Power Research Institute (EPRI) in Broomfield, Colorado, last May drew more than 60 industry experts from around the world to participate in a comprehensive discussion about the need for and impacts of active power controls from wind plants. Various forms of active power control can help stabilize the grid by enabling generating sources to increase or decrease power output to meet the constantly fluctuating needs of meeting the load demand and avoid events that can cause brownouts and power failures. The three forms of active power control discussed during the workshop were inertial control,

106

Research on fuzzy logic based dynamic boundary voltage and reactive power integrated control method  

Science Journals Connector (OSTI)

Aiming at the existing problems of conventional substation voltage and reactive power integrated control method, a new fuzzy logic based dynamic reactive power boundary voltage and reactive power integrated control method is proposed. Fuzzy logic control ... Keywords: dynamic boundary, fuzzy logic, reactive power, voltage

Zigang Xu; Fei Wang

2009-06-01T23:59:59.000Z

107

Active and reactive power ripple minimization in direct power control of matrix converter-fed DFIG  

Science Journals Connector (OSTI)

Abstract Despite the advantages of matrix converters (MCs) compared with standard voltage source converters (VSCs), all of the direct power control (DPC) strategies for doubly fed induction generator (DFIG) reported in the literature, only utilize VSCs. In this paper, the influence of MC voltage vectors on active and reactive powers variation is investigated. Compared with VSCs, \\{MCs\\} generate higher number of voltage vectors. Using this inherent advantage of MC, the main contribution of this paper is to reduce large active and reactive power ripples which is one of the main drawbacks of conventional DPC method. Utilizing a wide range of voltage vectors with different amplitudes, a new switching table is derived which using this table, not only large power ripple is compensated but also, a close to unity input power factor for MC can be achieved. In the other word, the presented scheme adds the advantages of MC and DPC together. Moreover, Owing to the operation of MC in direct acac form, the presented scheme effectively eliminates the need for the grid side converter used in conventional DPC, which has a complicated control method is eliminated. Simulation results show the effectiveness of the proposed method and have a reasonable correspondence with theoretical and mathematical analysis.

Arjang Yousefi-Talouki; Edris Pouresmaeil; Bo Nrregaard Jrgensen

2014-01-01T23:59:59.000Z

108

Alternative Fuels Data Center: Students Power Remote-Controlled Cars With  

Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

Students Power Students Power Remote-Controlled Cars With Biodiesel to someone by E-mail Share Alternative Fuels Data Center: Students Power Remote-Controlled Cars With Biodiesel on Facebook Tweet about Alternative Fuels Data Center: Students Power Remote-Controlled Cars With Biodiesel on Twitter Bookmark Alternative Fuels Data Center: Students Power Remote-Controlled Cars With Biodiesel on Google Bookmark Alternative Fuels Data Center: Students Power Remote-Controlled Cars With Biodiesel on Delicious Rank Alternative Fuels Data Center: Students Power Remote-Controlled Cars With Biodiesel on Digg Find More places to share Alternative Fuels Data Center: Students Power Remote-Controlled Cars With Biodiesel on AddThis.com... April 14, 2012 Students Power Remote-Controlled Cars With Biodiesel

109

Combining Droop Curve Concepts with Control Systems for Wind Turbine Active Power Control: Preprint  

SciTech Connect (OSTI)

Wind energy is becoming a larger portion of the global energy portfolio and wind penetration has increased dramatically in certain regions of the world. This increasing wind penetration has driven the need for wind turbines to provide active power control (APC) services to the local utility grid, as wind turbines do not intrinsically provide frequency regulation services that are common with traditional generators. It is common for large scale wind turbines to be decoupled from the utility grid via power electronics, which allows the turbine to synthesize APC commands via control of the generator torque and blade pitch commands. Consequently, the APC services provided by a wind turbine can be more flexible than those provided by conventional generators. This paper focuses on the development and implementation of both static and dynamic droop curves to measure grid frequency and output delta power reference signals to a novel power set point tracking control system. The combined droop curve and power tracking controller is simulated and comparisons are made between simulations using various droop curve parameters and stochastic wind conditions. The tradeoffs involved with aggressive response to frequency events are analyzed. At the turbine level, simulations are performed to analyze induced structural loads. At the grid level, simulations test a wind plant's response to a dip in grid frequency.

Buckspan, A.; Aho, J.; Pao, L.; Fleming, P.; Jeong, Y.

2012-06-01T23:59:59.000Z

110

Control of Noise in Power Station Cooling Tower Systems  

Science Journals Connector (OSTI)

Power?station cooling tower systems must handle large volumes of water and air with large potential energy in the water flows and the requirement for large fans. To minimize the noise generated at power station sites use is made of efficient tower fill materials dual low?speed fans (which shifts the spectrum and lowers mid?frequency noise level) and barrier effects in tower location and orientation. Conventional noise control measures such as mufflers are avoided because of the required increase in pressure across the fan and the high initial cost for quieting large towers. The use of natural draft towers is discussed and it is shown that although the low?frequency noise may be reduced the noise levels at typical property line locations are of the same order of magnitude as that for conventional mechanical cooling towers. Since cooling towers at power stations are required as an environmental (thermal) pollution control measure a trade?off between temperature rise of local water supplies versus increases in community noise becomes a critical factor.

Lewis S. Goodfriend

1973-01-01T23:59:59.000Z

111

The effect of high penetration of wind power on primary frequency control of power systems.  

E-Print Network [OSTI]

??In this work, a power system with wind power units and hydro power units are considered. The hydro power unit and variable speed wind turbine (more)

Motamed, Bardia

2013-01-01T23:59:59.000Z

112

Power control of dual-motor electric drive for tracked vehicles  

Science Journals Connector (OSTI)

The fundamental problem of the power control for the driving of a dual-motor drive electric tracked vehicle is analyzed. The tracked vehicle and its electric drive system are mathematically modeled. Power control...

Yuan Zou; Chengning Zhang; Fengchun Sun

2010-03-01T23:59:59.000Z

113

Automating controller tuning for gas-turbine mini power stations in computer testing  

Science Journals Connector (OSTI)

We justify the application of mathematical modeling methods for electric power systems in order to automate the tuning of controllers in control systems of gas-turbine power stations constructed on the basis of c...

A. I. Polulyakh; I. G. Lisovin; B. V. Kavalerov

2014-07-01T23:59:59.000Z

114

E-Print Network 3.0 - automatic power control Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Power Transmission, Distribution and Plants ; Engineering 7 Modeling of wind farm controllers Poul Srensen1 Summary: as the overall control on the wind farm level....

115

E-Print Network 3.0 - adaptive power control Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

controller, which does not need any... Coordinating Control of a Power System with Wind Farm Integration and Multiple FACTS Devices", Neural Networks... , "Coordinated Reactive...

116

Switching power supply  

DOE Patents [OSTI]

The invention is a repratable capacitor charging, switching power supply. A ferrite transformer steps up a dc input. The transformer primary is in a full bridge configuration utilizing power MOSFETs as the bridge switches. The transformer secondary is fed into a high voltage, full wave rectifier whose output is connected directly to the energy storage capacitor. The transformer is designed to provide adequate leakage inductance to limit capacitor current. The MOSFETs are switched to the variable frequency from 20 to 50 kHz to charge a capacitor from 0.6 kV. The peak current in a transformer primary and secondary is controlled by increasing the pulse width as the capacitor charges. A digital ripple counter counts pulses and after a preselected desired number is reached an up-counter is clocked.

Mihalka, A.M.

1984-06-05T23:59:59.000Z

117

Reference Model for Control and Automation Systems in Electrical Power  

Broader source: Energy.gov (indexed) [DOE]

Reference Model Reference Model for Control and Automation Systems in Electrical Power Version 1.2 October 12, 2005 Prepared by: Sandia National Laboratories' Center for SCADA Security Jason Stamp, Technical Lead Michael Berg, Co-Technical Lead Michael Baca, Project Lead This work was conducted for the DOE Office of Electricity Delivery and Energy Reliability under Contract M64SCADSNL Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. 2 Contents 1 Executive Summary.................................................................................................3 2 Introduction..............................................................................................................4

118

E-beam high voltage switching power supply  

DOE Patents [OSTI]

A high-power power supply produces a controllable, constant high voltage put under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules.

Shimer, Daniel W. (Danville, CA); Lange, Arnold C. (Livermore, CA)

1996-01-01T23:59:59.000Z

119

E-beam high voltage switching power supply  

DOE Patents [OSTI]

A high-power power supply produces a controllable, constant high voltage output under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules. 5 figs.

Shimer, D.W.; Lange, A.C.

1996-10-15T23:59:59.000Z

120

A Game Strategy for Power Flow Control of Distributed Generators in Smart Grids  

Science Journals Connector (OSTI)

We consider the distributed power control problem of distributed generators(DGs) in smart grid. In order...

Jianliang Zhang; Donglian Qi; Guoyue Zhang

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Observer-based control of a tethered wing wind power system: indoor real-time experiment  

E-Print Network [OSTI]

Observer-based control of a tethered wing wind power system: indoor real-time experiment Ahmad, a novel wind power system based on a tethered wing is presented. An observer-based control strategy WindPower, Joby energy [8] or Makani Power [9], is composed of one or several airborne wind turbines

Paris-Sud XI, Université de

122

MARTHA: Architecture for Control and Emulation of Power Electronics and Smart Grid Systems  

E-Print Network [OSTI]

conversion; (3) it allows for power flow control between an electric vehicle motor and battery; and (4 conversion technology [1] that enables efficient and fully controllable conversion of electrical power) it enables power grid dynamic stabilization. Power electronics could potentially reduce overall electricity

Devadas, Srinivas

123

Instrumentation and Controls evaluation for space nuclear power systems  

SciTech Connect (OSTI)

Design of control and protection systems should be coordinated with the design of the neutronic, thermal-hydraulic, and mechanical aspects of the core and plant at the earliest possible stage of concept development. An integrated systematic design approach is necessary to prevent uncoordinated choices in one technology area from imposing impractical or impossible requirements in another. Significant development and qualification will be required for virtually every aspect of reactor control and instrumentation. In-core instrumentation widely used in commercial light water reactors will not likely be usable in the higher temperatures of a space power plant. Thermocouples for temperature measurement and gamma thermometers for flux measurement appear to be the only viable candidates. Recent developments in ex-core neutron detectors may provide achievable alternatives to in-core measurements. Reliable electronic equipment and high-temperature actuators will require major development efforts.

Anderson, J.L.; Oakes, L.C.

1984-01-01T23:59:59.000Z

124

Joint Power Control and Link Scheduling in Wireless Networks for Throughput Optimization  

E-Print Network [OSTI]

Joint Power Control and Link Scheduling in Wireless Networks for Throughput Optimization Liqun Fu formulate the general joint link scheduling and power control problem as an in- teger linear programming optimality. Index Terms--scheduling, power control, SINR constraints. I. INTRODUCTION Due to their unconfined

Huang, Jianwei

125

Energy Efficient Joint Scheduling and Power Control for Wireless Sensor Networks  

E-Print Network [OSTI]

Energy Efficient Joint Scheduling and Power Control for Wireless Sensor Networks Gang Lu in TDMA link scheduling with transmission power control using a realistic SINR-based interference model. We then investigate the scheduling and power control problem with the objective of minimizing

Krishnamachari, Bhaskar

126

Joint Scheduling, Power Control and Routing in Symmetric, One-dimensional, Multi-hop Wireless Networks  

E-Print Network [OSTI]

Joint Scheduling, Power Control and Routing in Symmetric, One-dimensional, Multi-hop Wireless scheduling, routing and power control that achieves max-min fair rate allocation in a multi-hop wireless that a traditional layering network approach, separating routing, scheduling, flow and power control

Paris-Sud XI, Université de

127

Control of a Fuel-Cell Powered DC Electric Vehicle Motor  

E-Print Network [OSTI]

Control of a Fuel-Cell Powered DC Electric Vehicle Motor Federico Zenith Sigurd Skogestad of a Fuel-Cell Powered DC Electric Vehicle Motor #12;3 Currently Available Models and Control Strategies Skogestad, Control of a Fuel-Cell Powered DC Electric Vehicle Motor #12;3 Currently Available Models

Skogestad, Sigurd

128

Reactive power control of grid-connected wind farm based on adaptive dynamic programming  

E-Print Network [OSTI]

is widely used in the wind power system for its advantages over other two types [5]. The characteristicsReactive power control of grid-connected wind farm based on adaptive dynamic programming Yufei Tang Wind farm Power system Adaptive control a b s t r a c t Optimal control of large-scale wind farm has

He, Haibo

129

Sliding Mode Power Control of Variable Speed Wind Energy Conversion Systems  

E-Print Network [OSTI]

Sliding Mode Power Control of Variable Speed Wind Energy Conversion Systems B. Beltran, T. Ahmed power generation in variable speed wind energy conversion systems (VS-WECS). These systems have two variations. Index Terms--Wind energy conversion system, power generation control, sliding mode control

Boyer, Edmond

130

A nonlinear robust HVDC control for a parallel AC/DC power system  

E-Print Network [OSTI]

A nonlinear robust HVDC control for a parallel AC/DC power system Hongzhi Cai a , Zhihua Qu b. Keywords: Robust control; HVDC; Power system; Stability; Lyapunov method 1. Introduction It has been recognized that, through an HVDC transmission line, fast electronic control can be applied on the DC power

Qu, Zhihua

131

Real Power and Reactive Power Control of a Three-Phase Single-Stage-PV System and PV voltage Stability  

SciTech Connect (OSTI)

Grid-connected photovoltaic (PV) systems with power electronic interfaces can provide both real and reactive power to meet power system needs with appropriate control algorithms. This paper presents the control algorithm design for a three-phase single-stage grid-connected PV inverter to achieve either maximum power point tracking (MPPT) or a certain amount of real power injection, as well as the voltage/var control. The switching between MPPT control mode and a certain amount of real power control mode is automatic and seamless. Without the DC-to-DC booster stage, PV DC voltage stability is an important issue in the control design especially when the PV inverter is operating at maximum power point (MPP) with voltage/var control. The PV DC voltage collapse phenomenon and its reason are discussed. The method based on dynamic correction of the PV inverter output is proposed to ensure PV DC voltage stability. Simulation results of the single-stage PV system during system disturbances and fast solar irradiation changes confirm that the proposed control algorithm for single-stage PV inverters can provide appropriate real and reactive power services and ensure PV DC voltage stability during dynamic system operation and atmospheric conditions.

Li, Huijuan [ORNL] [ORNL; Xu, Yan [ORNL] [ORNL; Adhikari, Sarina [ORNL] [ORNL; Rizy, D Tom [ORNL] [ORNL; Li, Fangxing [ORNL] [ORNL; Irminger, Philip [ORNL] [ORNL

2012-01-01T23:59:59.000Z

132

International Space Station power module thermal control system hydraulic performance  

SciTech Connect (OSTI)

The International Space Station (ISS) uses four photovoltaic power modules (PVMs) to provide electric power for the US On-Orbit Segment. The PVMs consist of photovoltaic arrays (PVAs), orbit replaceable units (ORUs), photovoltaic radiators (PVRs), and a thermal control system (TCS). The PVM TCS function is to maintain selected PVM components within their specified operating ranges. The TCS consists of the pump flow control subassembly (PFCS), piping system, including serpentine tubing for individual component heat exchangers, headers/manifolds, fluid disconnect couplings (FQDCs), and radiator (PVR). This paper describes the major design requirements for the TCS and the results of the system hydraulic performance predictions in regard to these requirements and system component sizing. The system performance assessments were conducted using the PVM TCS fluid network hydraulic model developed for predicting system/component pressure losses and flow distribution. Hardy-Cross method of iteration was used to model the fluid network configuration. Assessments of the system hydraulic performance were conducted based on an evaluation of uncertainties associated with the manufacturing and design tolerances. Based on results of the analysis, it was concluded that all design requirements regarding system performance could be met. The hydraulic performance range, enveloping possible system operating parameter variations was determined.

Goldberg, V. [Boeing North American, Inc., Canoga Park, CA (United States). Rocketdyne Div.

1997-12-31T23:59:59.000Z

133

Precision control of high temperature furnaces using an auxiliary power supply and charged practice current flow  

DOE Patents [OSTI]

Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved.

Pollock, George G. (San Ramon, CA)

1997-01-01T23:59:59.000Z

134

Precision control of high temperature furnaces using an auxiliary power supply and charged particle current flow  

DOE Patents [OSTI]

Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved. 5 figs.

Pollock, G.G.

1997-01-28T23:59:59.000Z

135

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network [OSTI]

of large amounts of wind power production might requirewill be satisfactory as wind power provides an increasing64 7.2 Wind Power in Relation to System

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

136

Controller Design and Implementation for a Powered Prosthetic Knee  

E-Print Network [OSTI]

of the prosthetic foot, yet the Power Knee may do this.25]. Power inputted at the ankle is responsible for footfoot be the most efficient in motion and electrical power

Rosa, Matthew David

2012-01-01T23:59:59.000Z

137

Optimal tuning of PI controller using PSO optimization for indirect power control for DFIG based wind turbine with MPPT  

Science Journals Connector (OSTI)

In this paper, an artificial intelligence method particle swarm optimization (PSO) algorithm is presented for determining the optimal PI controller parameters for the indirect control active and reactive power of...

Youcef Bekakra; Djilani Ben Attous

2014-09-01T23:59:59.000Z

138

Inverter System Design and Control for a Wave Power Substation.  

E-Print Network [OSTI]

?? This Master thesis has been performed as part of the Lysekil wave power project at the Division of Electricity, Uppsala University. Power electronics, placed (more)

Ekstrm, Rickard

2009-01-01T23:59:59.000Z

139

Comparison of Thyristor-Rectifier with Hybrid Filter and Chopper-Rectifier for High-Power, High-Current Application  

E-Print Network [OSTI]

performance, efficiency, size and cost for an industrial load with given sys- tem specifications. 1 and chemical industries [1]-[6]. Chemical electrolysis is used in metal refining (from impure stock) and metal winning (from ore) [2]. Hydrogen, chlorine, sodium hydroxide, sodium chlorate, ox- ygen and adiponitrile

Paderborn, Universität

140

Controlling mercury emissions from coal-fired power plants  

SciTech Connect (OSTI)

Increasingly stringent US federal and state limits on mercury emissions form coal-fired power plants demand optimal mercury control technologies. This article summarises the successful removal of mercury emissions achieved with activated carbon injection and boiler bromide addition, technologies nearing commercial readiness, as well as several novel control concepts currently under development. It also discusses some of the issues standing in the way of confident performance and cost predictions. In testing conducted on western coal-fired units with fabric filters or TOXECON to date, ACI has generally achieved mercury removal rates > 90%. At units with ESPs, similar performance requires brominated ACI. Alternatively, units firing western coals can use boiler bromide addition to increase flue gas mercury oxidation and downstream capture in a wet scrubber, or to enhance mercury removal by ACI. At eastern bituminous fired units with ESPs, ACI is not as effective, largely due to SO{sub 3} resulting from the high sulfur content of the coal or the use of SO{sub 3} flue gas conditioning to improve ESP performance. 7 refs., 3 figs.

Chang, R. [Electric Power Research Institute, Palo Alto, CA (United States)

2009-07-15T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Individual Pitch Control for Mitigation of Power Fluctuation of Variable Speed Wind Turbines  

E-Print Network [OSTI]

Individual Pitch Control for Mitigation of Power Fluctuation of Variable Speed Wind Turbines, China mcheng@seu.edu.cn Abstract-- Grid connected wind turbines are the sources of power fluctuations presents an individual pitch control (IPC) strategy to mitigate the wind turbine power fluctuation at both

Hu, Weihao

142

Predictive Power Control of Doubly-Fed Induction Generator for Wave Energy Converters  

E-Print Network [OSTI]

the Doubly- fed induction generator (DFIG). This paper deals then with a model-based predictive power control of a DFIG-based Wave Energy Converter (WEC). In the proposed control approach, the predicted output power was calculated using a DFIG linearized state-space model. The DFIG-based WEC power tracking performances further

Paris-Sud XI, Université de

143

Inserting Test Points to Control Peak Power During Scan Testing Ranganathan Sankaralingam and Nur A. Touba  

E-Print Network [OSTI]

simply reducing the average power dissipation per clock cycle. Proceedings of the 17th IEEE International. The average power dissipation during scan testing can be controlled by reducing the scan frequency. However, the peak power during scan testing cannot be controlled by reducing clock frequency and hence is more

Touba, Nur A.

144

Model-Free Based Water Level Control for Hydroelectric Power Plants  

E-Print Network [OSTI]

Model-Free Based Water Level Control for Hydroelectric Power Plants Cédric JOIN Gérard ROBERT for hydroelectric run-of-the river power plants. To modulate power generation, a level trajectory is planned, the set-point is followed even in severe operating conditions. Keywords: Hydroelectric power plants

Paris-Sud XI, Université de

145

Var Coordinated Control of DFIG Impact on Small Signal Stability of Power System  

Science Journals Connector (OSTI)

The wind farm based on Doubly Fed Induction Generator (DFIG) is built. Not only it can be as active power source to provide active power to network, but also as reactive power source to stabilize voltage or supply Var compensation (reactive power absorbed ... Keywords: Doubly Fed Induction Generator, Var coordinated control, low-frequency oscillation, small signal stability

Lei Wang; Hongjie Jia

2012-04-01T23:59:59.000Z

146

Prognostic Control and Load Survivability in Shipboard Power Systems  

E-Print Network [OSTI]

, etc. Transmission systems consist of transformers, circuit breakers, and transmission lines to deliver power from the generation power plants to distribution systems. Commercial, residential, and industrial customers are the types of loads served... cannot supply power to it, then it should be powered through its alternate path. The process of restoring, balancing, and minimizing power losses to loads is called network reconfiguration. Prognostics is the ability to predict precisely and accurately...

Thomas, Laurence J.

2011-02-22T23:59:59.000Z

147

Controlling Power Plant CO2 Emissions: A Long-Range View  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

CONTROLLING POWER PLANT CO CONTROLLING POWER PLANT CO 2 EMISSIONS: A LONG RANGE VIEW John Marion (john.l.marion@power.alstom.com; 860-285-4539) Nsakala ya Nsakala (nsakala.y.nsakala@power.alstom.com; 860-285-2018) ALSTOM Power Plant Laboratories 2000 Day Hill Road Windsor, CT 06095, USA Timothy Griffin (timothy.griffin@power.alstom.com; +41 56/486 82 43) Alain Bill (alain.bill@power.alstom.com; +41 56/486 81 07) ALSTOM Power Technology Center 5405 Baden-Daettwil, Switzerland ABSTRACT ALSTOM Power (ALSTOM) is an international supplier of power generation with concern for the environment. We are aware of the present scientific concerns regarding greenhouse gas emissions and the role of fossil fuel use for power generation. Although the scientific and policy dialogue on global climate change is far from conclusive, ALSTOM continues to

148

Power Controlled Minimum Frame Length Scheduling in TDMA Wireless Networks with  

E-Print Network [OSTI]

Power Controlled Minimum Frame Length Scheduling in TDMA Wireless Networks with Sectored Antennas controlled min- imum frame length scheduling for TDMA wireless networks. Given a set of one-hop transmission scheduling and power control was first addressed by Tamer and Ephremides in [1, 2]. Given a set of one

Arabshahi, Payman

149

Co-design of Embedded Controllers for Power Electronics and Electric Systems  

E-Print Network [OSTI]

, Electric process. I. INTRODUCTION Today, variable speed motor control systems have a wide rangeCo-design of Embedded Controllers for Power Electronics and Electric Systems Slim Ben Saoud L for the design of control systems for power electronics and electric drives. We discuss the case of a DC system

California at Irvine, University of

150

Proportional EMG Control of Ankle Plantar Flexion in a Powered Transtibial Prosthesis  

E-Print Network [OSTI]

Proportional EMG Control of Ankle Plantar Flexion in a Powered Transtibial Prosthesis Jing Wang plantar flexion in the trailing prosthetic ankle increases. Not surprisingly, excessive loads to control a powered ankle- foot prosthesis using a volitional electromyographic (EMG) control to directly

Herr, Hugh

151

A Study on Control of a Small Fuel Cell Power Supply System for Robots  

Science Journals Connector (OSTI)

A hydrogen fuel cell power supply system which includes pressure valve, solenoid valves, flow controllers, temperature sensors and Proton Exchange Membrane Fuel Cell ... is presented in the paper. The power supply

Kuo-Ching Tseng; Pao-Chuan Tseng; Shih-Hsien Yang

2011-01-01T23:59:59.000Z

152

Air Cooling Technology for Power Electronic Thermal Control  

Broader source: Energy.gov (indexed) [DOE]

Characterization Platform * Air flow rate control * High accuracy heat transfer measurement * Velocity field characterization * Automated control and data acquisition...

153

Power control of a wind farm with active stall wind turbines and AC grid connection  

E-Print Network [OSTI]

Power control of a wind farm with active stall wind turbines and AC grid connection Anca D. Hansen1 controller for a wind farm made-up exclusively of active stall wind turbines with AC grid connection wind farm control involves both the control on wind turbine level as well as the central control

154

The Optimal Power Tracking Control Strategy of Grid-Connected Excited Synchronous Wind Power Generator.  

E-Print Network [OSTI]

??In this thesis, the wind power system is a coaxial coupling structure between servo motor and excited synchronous wind power generator. By using the excited (more)

Cheng, Wen-kai

2014-01-01T23:59:59.000Z

155

Frequency Control Of Micro Hydro Power Plant Using Electronic Load Controller  

E-Print Network [OSTI]

Water turbines, like petrol or diesel engines, will vary in speed as load is applied or relieved. Although not such a great problem with machinery which uses direct shaft power, this speed variation will seriously affect both frequency and voltage output from a generator. Traditionally, complex hydraulic or mechanical speed governors altered flow as the load varied, but more recently an electronic load controller (ELC) has been developed which has increased the simplicity and reliability of modern micro-hydro sets. An ELC is a solid-state electronic device designed to regulate output power of a micro-hydropower system and maintaining a near-constant load on the turbine generates stable voltage and frequency. In this paper an ELC constantly senses and regulates the generated frequency. The frequency is directly proportional to the speed of the turbine.

unknown authors

156

Speed And Power Control Of An Engine By Modulation Of The Load Torque  

DOE Patents [OSTI]

A system and method of speed and power control for an engine in which speed and power of the engine is controlled by modulation of the load torque. The load torque is manipulated in order to cause engine speed, and hence power to be changed. To accomplish such control, the load torque undergoes a temporary excursion in the opposite direction of the desired speed and power change. The engine and the driven equipment will accelerate or decelerate accordingly as the load torque is decreased or increased, relative to the essentially fixed or constant engine torque. As the engine accelerates or decelerates, its power increases or decreases in proportion.

Ziph, Benjamin (Ann Arbor, MI); Strodtman, Scott (Ypsilanti, MI); Rose, Thomas K (Chelsea, MI)

1999-01-26T23:59:59.000Z

157

Instantaneous Active and Nonactive Power Control of Distributed Energy Resources with Current Limiter  

SciTech Connect (OSTI)

Abstract -- Distributed energy resources (DER) with a power electronics inverter interface can provide both active power and nonactive power simultaneously and independently. A decoupled control algorithm of active power and nonactive power is developed based on the instantaneous active power and nonactive power theory. A current limiter is combined to the control algorithm, and it ensures that the inverter is not overloaded. During the normal system operation, the active power has higher priority over the nonactive power so that the energy from a DER can be fully transferred to the grid. Within the inverter s capability, nonactive power is provided to the grid as required. With this control algorithm, the inverter s capabilities are taken full advantage at all times, both in terms of functionality as well as making use of its full KVA rating. Through the algorithm, the inverter s active power and nonactive power are controlled directly, simultaneously, and independently. Several experimental results fully demonstrate the validity and effectiveness of this new control algorithm. As evidenced by the fast dynamic response that results, a DER system with the control algorithm can provide full services to the grid in both steady state and during transient events.

Xu, Yan [ORNL; Li, Huijuan [ORNL; Rizy, D Tom [ORNL; Li, Fangxing [ORNL; Kueck, John D [ORNL

2010-01-01T23:59:59.000Z

158

Organizational Control Reconfigurations for a Robust Smart Power Grid  

Science Journals Connector (OSTI)

Large-scale cyber-physical infrastructures, such as the Smart Power Grid, are envisioned as some of the core ... administrators. Overloading and failures in the Smart Power Grid threaten the matching of demand-su...

Evangelos Pournaras; Mark Yao; Ron Ambrosio

2013-01-01T23:59:59.000Z

159

Electric Power Esearch Institute: Environmental Control Technology Center  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute`s (EPRI`s) Environmental Control Technology Center (ECTC). Testing for the month involved the EPRI Integrated SO{sub x}/NO{sub x} removal process, the DOE PRDA testing of the B&W/Condensing Heat Exchanger (CHX), and support for the Semi-Continuous On-line Mercury Analyzer. The test configuration utilized in the EPRI Integrated SO{sub x}/NO{sub x} removal process included the 4.0 MW Spray Dryer Absorber (SDA), the Pulse-jet Fabric Filter (PJFF), and a new Selective Catalytic Reduction (SCR) reactor installed at the ECTC. During this testing, O&M support was also required to conclude the test efforts under the EPRI Hazardous Air Pollutant (HAP) test block. This included the on-site development efforts for the Semi-Continuous On-line Mercury Analyzer. In the DOE PRDA project with the B&W/Condensing Heat Exchanger (CHX), the effects of the increased particulate loading to the unit were monitored throughout the month. Also, the 1.0 MW Cold-Side Selective Catalytic Reduction (SCR) unit and the 4.0 MW Pilot Wet Scrubber remained idle this month in a cold-standby mode and were inspected regularly.

NONE

1996-11-01T23:59:59.000Z

160

Sleep Control for Base Stations Powered by Heterogeneous Energy Sources  

E-Print Network [OSTI]

to the power grid, some BSs are purely powered by the renewable energy. BS sleep is introduced not only to save grid power, but also to store renewable energy for future use when the temporal traffic variation does is to exploit renewable energy, e.g. solar energy, wind energy and so on. The technology, termed as "energy

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

RELIABLE CONTROL AND ONLINE MONITORING DESIGN FOR NUCLEAR POWER PLANT WITH IRIS DEMONSTRATION.  

E-Print Network [OSTI]

??Development and deployment of small-scale nuclear power reactors and their autonomous control and monitoring is part of the mission under the Global Nuclear Energy Partnership (more)

Guo, Yin

2010-01-01T23:59:59.000Z

162

Adaptive hybrid predictive control for a combined cycle power plant optimization .  

E-Print Network [OSTI]

??The design and development of an adaptive hybrid predictive controller for the optimization of a real combined cycle power plant (CCPP) are presented. The real (more)

Sez, D.

2008-01-01T23:59:59.000Z

163

Optimization and control of a large-scale solar chimney power plant.  

E-Print Network [OSTI]

??ENGLISH ABSTRACT: The dissertation builds on previous research (Pretorius, 2004) and investigates the optimization and control of a large-scale solar chimney power plant. Performance results (more)

Pretorius, Johannes Petrus

2007-01-01T23:59:59.000Z

164

Study Shows Active Power Controls from Wind May Increase Revenues and Improve System Reliability  

Broader source: Energy.gov [DOE]

The DOE Wind Program and the National Renewable Energy Laboratory recently published a study conducted in collaboration with the Electric Power Research Institute and the University of Colorado. Researchers examined how the contribution of wind power providing active power controls could benefit the total power system economics, increase revenue streams, and improve the reliability and security of the nations power system, all while having negligible impacts on the turbine and its components.

165

Direct power control of grid connected PV systems with three level NPC inverter  

SciTech Connect (OSTI)

This paper presents the control of a three-level Neutral Point Clamped (NPC) voltage source inverter for grid connected photovoltaic (PV) systems. The control method used is the Extended Direct Power Control (EDPC), which is a generic approach for Direct Power Control (DPC) of multilevel inverters based on geometrical considerations. Maximum Power Point Tracking (MPPT) algorithms, that allow maximal power conversion into the grid, have been included. These methods are capable of extracting maximum power from each of the independent PV arrays connected to each DC link voltage level. The first one is a conventional MPPT which outputs DC link voltage references to EDPC. The second one is based on DPC concept. This new MPPT outputs power increment references to EDPC, thus avoiding the use of a DC link voltage regulator. The whole control system has been tested on a three-level NPC voltage source inverter connected to the grid and results confirm the validity of the method. (author)

Alonso-Martinez, Jaime; Eloy-Garcia, Joaquin; Arnaltes, Santiago [Dept. of Electrical Engineering, University Carlos III of Madrid, Avda. Universidad 30, 28911 Leganes, Madrid (Spain)

2010-07-15T23:59:59.000Z

166

Advanced regulatory control and coordinated plant-wide control strategies for IGCC targeted towards improving power ramp-rates  

SciTech Connect (OSTI)

As part of ongoing R&D activities at the National Energy Technology Laboratory's (NETL) Advanced Virtual Energy Simulation Training & Research (AVESTAR) Center, this paper highlights strategies for enhancing low-level regulatory control and system-wide coordinated control strategies implemented in a high-fidelity dynamic simulator for an Integrated Gasification Combined Cycle (IGCC) power plant with carbon capture. The underlying IGCC plant dynamic model contains 20 major process areas, each of which is tightly integrated with the rest of the power plant, making individual functionally-independent processes prone to routine disturbances. Single-loop feedback control although adequate to meet the primary control objective for most processes, does not take into account in advance the effect of these disturbances, making the entire power plant undergo large offshoots and/or oscillations before the feedback action has an opportunity to impact control performance. In this paper, controller enhancements ranging from retuning feedback control loops, multiplicative feed-forward control and other control techniques such as split-range control, feedback trim and dynamic compensation, applicable on various subsections of the integrated IGCC plant, have been highlighted and improvements in control responses have been given. Compared to using classical feedback-based control structure, the enhanced IGCC regulatory control architecture reduces plant settling time and peak offshoots, achieves faster disturbance rejection, and promotes higher power ramp-rates. In addition, improvements in IGCC coordinated plant-wide control strategies for Gasifier-Lead, GT-Lead and Plantwide operation modes have been proposed and their responses compared. The paper is concluded with a brief discussion on the potential IGCC controller improvements resulting from using advanced process control, including model predictive control (MPC), as a supervisory control layer.

Mahapatra, P.; Zitney, S.

2012-01-01T23:59:59.000Z

167

Virtual Power Plant Simulation and Control Scheme Design.  

E-Print Network [OSTI]

?? Virtual Power Plant (VPP) is a concept that aggregate Distributed Energy Resources (DER) together, aims to overcome the capacity limits of single DER and (more)

Chen, Zhenwei

2012-01-01T23:59:59.000Z

168

Lillgrund Wind Farm Modelling and Reactive Power Control.  

E-Print Network [OSTI]

?? The installation of wind power plant has significantly increased since several years due to the recent necessity of creating renewable and clean energy sources. (more)

Boulanger, Isabelle

2009-01-01T23:59:59.000Z

169

Thermal Control of Power Electronics of Electric Vehicles with...  

Broader source: Energy.gov (indexed) [DOE]

RelevanceObjectives Objectives: * Explore the potential of nucleate boiling for vehicle power electronics cooling. * Conduct numerical heat transfer simulations. * Experimentally...

170

Design and Control of High Power Density Motor Drive.  

E-Print Network [OSTI]

??This dissertation aims at developing techniques to achieve high power density in motor drives under the performance requirements for transportation system. Four main factors influencing (more)

Jiang, Dong

2011-01-01T23:59:59.000Z

171

Low-Power Maximum Power Point Tracker with Digital Control for Thermophotovoltaic Generators  

E-Print Network [OSTI]

This paper describes the design, optimization, and evaluation of the power electronics circuitry for a low-power portable thermophotovotaic (TPV) generator system. TPV system is based on a silicon micro-reactor design and ...

Pilawa, Robert

172

DRPM: Dynamic Speed Control for Power Management in Server Class Disks Sudhanva Gurumurthi  

E-Print Network [OSTI]

[5] that power densities of data centers could grow to over 100 Watts per square foot and that the caDRPM: Dynamic Speed Control for Power Management in Server Class Disks Sudhanva Gurumurthi portion of the power budget in server environ- ments goes into the I/O subsystem - the disk array in par

Sivasubramaniam, Anand

173

Distribution lines overload control to increase reliability and power loss reduction  

Science Journals Connector (OSTI)

The Indian Power sector is currently undergoing sea change. The pace of economic development along with increasing power demand would require additional generating capacity. Simultaneously increased efficiency in the sector can help in the task of achieving ... Keywords: ASCR conductor, controlling carbon emission, distribution lines, overload, power losses, reliability

Shrirang Karandikar; Ashok Ghatol

2008-04-01T23:59:59.000Z

174

Optimal adaptive control of cascading power grid failures1 Version 2010-Dec-20  

E-Print Network [OSTI]

Optimal adaptive control of cascading power grid failures1 Version 2010-Dec-20 Daniel Bienstock Columbia University New York 1 Introduction Power grids have long been a source of interesting optimization, the central modeling ingredient is that power grids display cascading behavior. A cascade is the process

Bienstock, Daniel

175

Quantitative Analysis of Transmission Power Control in Wireless Ad-hoc Networks  

E-Print Network [OSTI]

1 Quantitative Analysis of Transmission Power Control in Wireless Ad-hoc Networks Seung-Jong Park the issue of transmission power con- trol in wireless ad-hoc networks. In general, it is assumed that minimum transmission power achieves the optimal throughput of an ad-hoc network because it produces

Park, Seung-Jong "Jay"

176

Distributed Battery Control to Improve Peak Power Shaving Efficiency in Data Centers  

E-Print Network [OSTI]

Rack PDU BackupMain Bus-type power network Utility Diesel Generator ATS PDU Server Rack Server RackDistributed Battery Control to Improve Peak Power Shaving Efficiency in Data Centers Baris Aksanli, Eddie Pettis and Tajana S. Rosing UCSD, Google Stored energy in batteries can be used to cap peak power

Simunic, Tajana

177

Control of a wind power system based on a tethered wing  

E-Print Network [OSTI]

Control of a wind power system based on a tethered wing R. Lozano Jr, M. Alamir, J. Dumon, A. Abstract: This paper presents a wind power system based on a kite attached with a rope to a dynamo. INTRODUCTION In the last few years new alternative systems for wind power generation [1-8] have appeared which

Paris-Sud XI, Université de

178

Pricing Hydroelectric Power Plants with/without Operational Restrictions: a Stochastic Control Approach  

E-Print Network [OSTI]

Pricing Hydroelectric Power Plants with/without Operational Restrictions: a Stochastic Control of Waterloo, Waterloo ON, Canada N2L 3G1 Abstract. In this paper, we value hydroelectric power plant cash operational constraints may considerably overestimate the value of hydroelectric power plant cashflows. 1

Forsyth, Peter A.

179

INTEGRATED ORBIT AND ATTITUDE CONTROL FOR A NANOSATELLITE WITH POWER CONSTRAINTS  

E-Print Network [OSTI]

AAS 03-100 INTEGRATED ORBIT AND ATTITUDE CONTROL FOR A NANOSATELLITE WITH POWER CONSTRAINTS Bo J. Naasz, Matthew M. Berry, Hye-Young Kim, and Christopher D. Hall§ Small satellites tend to be power as with other subsystems for limited electrical power. The Virginia Tech nanosatellite project, HokieSat, must

Hall, Christopher D.

180

Abdicating power for control: a precision timing strategy to modulate function of flight power muscles  

Science Journals Connector (OSTI)

...202, 3369-3375. 2 Josephson, R. K. 1985 Mechanical power output...Exp. Biol. 114, 493-512. 3 Marsh, R. L. , and J. M. Olson 1994 Power...1983-1997. 23 Girgenrath, M. , and R. L. Marsh 1999 Power output of sound-producing...

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Driving Low-Power Wearable Systems with an Adaptively-Controlled Foot-Strike Scavenging Platform  

E-Print Network [OSTI]

Driving Low-Power Wearable Systems with an Adaptively-Controlled Foot-Strike Scavenging Platform as a means to scavenge energy from foot-strikes and power wearable systems. While they exhibit large energy of foot pressure sensors to realize accurate control of the individual DEs. Statistical techniques

Potkonjak, Miodrag

182

NOISE CONTROL METHODS FOR A RECIPROCATING AIR COMPRESSOR USED IN FUEL CELL AUXILIARY POWER UNIT (APU)  

E-Print Network [OSTI]

NOISE CONTROL METHODS FOR A RECIPROCATING AIR COMPRESSOR USED IN FUEL CELL AUXILIARY POWER UNIT Air pollution Noise pollution Engine life Remedy Fuel cell APU Quieter Low emissions Exhaust Heat, Case History: Noise control approaches for an air-compressor in a fuel-cell auxiliary power unit, Noise

Carver, Jeffrey C.

183

Power Control in Spectrum Overlay Networks: How to Cross a Multi-Lane Highway  

E-Print Network [OSTI]

--Cognitive radio, opportunistic spectrum access, spec- trum overlay, power control, spectrum opportunity detectionPower Control in Spectrum Overlay Networks: How to Cross a Multi-Lane Highway Wei Ren, Qing Zhao in spectrum overlay networks (also referred to as opportunistic spectrum access) where secondary users

Islam, M. Saif

184

Robust control for wind power systems A. Pintea 1,2  

E-Print Network [OSTI]

Robust control for wind power systems A. Pintea 1,2 , D. Popescu 1 , P. Borne 2 1 University input and has shown good robustness indicator values. Keywords: Wind power, robustness, renewable energy advantages of wind turbine usage, engineers build different control systems and optimized their functioning

Paris-Sud XI, Université de

185

Computer simulation of magnetization-controlled shunt reactors for calculating electromagnetic transients in power systems  

SciTech Connect (OSTI)

A computer procedure for simulating magnetization-controlled dc shunt reactors is described, which enables the electromagnetic transients in electric power systems to be calculated. It is shown that, by taking technically simple measures in the control system, one can obtain high-speed reactors sufficient for many purposes, and dispense with the use of high-power devices for compensating higher harmonic components.

Karpov, A. S. [St Petersburg State Polytechnical University, JSC 'System Operator of the United Power System', Leningradskoe RDU (Russian Federation)] [St Petersburg State Polytechnical University, JSC 'System Operator of the United Power System', Leningradskoe RDU (Russian Federation)

2013-01-15T23:59:59.000Z

186

WIRELESS HELIOSTAT AND CONTROL SYSTEM FOR LARGE SELF-POWERED HELIOSTAT FIELDS  

E-Print Network [OSTI]

WIRELESS HELIOSTAT AND CONTROL SYSTEM FOR LARGE SELF-POWERED HELIOSTAT FIELDS Dr. Stephan Kubisch 1 of a wireless mesh network as control technology in a field of self-powered heliostats, thus eliminating heliostats field to be build in the future: About 100 small communication devices, so called Helio

Turau, Volker

187

Flicker mitigation by reactive power control in wind farm with doubly fed induction generators  

Science Journals Connector (OSTI)

Abstract This paper presents a novel wind farm control with the purpose to mitigate the flicker emission of doubly fed induction generators. The presented control strategy is implemented in a wind farm connected to a distribution grid with consumers. The control system is composed by two controllers in cascade, the wind farm control and the local wind turbine controller. The wind farm control adapts itself to the consumptions of the distribution network and generates the minimal reactive power which allows smoothing the fast variations of wind power output. In this sense, the wind farm control facilitates the integration of wind farm into weak power grids by exchanging reactive power with network. Moreover, the wind farm controller has to be stable, fast and robust and the wind farm dispatch function has to guarantees that the local wind turbine controller can exchange the reactive power set point with network. This controller has been developed with the simulation tool DigSilent PowerFactory v14.1.

Francesc Girbau-Llistuella; Andreas Sumper; Francisco Daz-Gonzlez; Samuel Galceran-Arellano

2014-01-01T23:59:59.000Z

188

Participation of wind power plants in system frequency control: Review of grid code requirements and control methods  

Science Journals Connector (OSTI)

Abstract Active power reserves are needed for the proper operation of an electrical system. These reserves are continuously regulated in order to match the generation and consumption in the system and thus, to maintain a constant electrical frequency. They are usually provided by synchronized conventional generating units such as hydraulic or thermal power plants. With the progressive displacement of these generating plants by non-synchronized renewable-based power plants (e.g. wind and solar) the net level of synchronous power reserves in the system becomes reduced. Therefore, wind power plants are required, according to some European Grid Codes, to also provide power reserves like conventional generating units do. This paper focuses not only on the review of the requirements set by Grid Codes, but also on control methods of wind turbines for their participation in primary frequency control and synthetic inertia.

Francisco Daz-Gonzlez; Melanie Hau; Andreas Sumper; Oriol Gomis-Bellmunt

2014-01-01T23:59:59.000Z

189

Utility-Scale Power Router: Dynamic Control of Grid Assets Using Direct AC Converter Cells  

SciTech Connect (OSTI)

ADEPT Project: Georgia Tech is developing a cost-effective, utility-scale power router that uses an enhanced transformer to more efficiently direct power on the grid. Existing power routing technologies are too expensive for widespread use, but the ability to route grid power to match real-time demand and power outages would significantly reduce energy costs for utilities, municipalities, and consumers. Georgia Tech is adding a power converter to an existing grid transformer to better control power flows at about 1/10th the cost of existing power routing solutions. Transformers convert the high-voltage electricity that is transmitted through the grid into the low-voltage electricity that is used by homes and businesses. The added converter uses fewer steps to convert some types of power and eliminates unnecessary power storage, among other improvements. The enhanced transformer is more efficient, and it would still work even if the converter fails, ensuring grid reliability.

None

2010-09-01T23:59:59.000Z

190

Experience curves for power plant emission control technologies  

E-Print Network [OSTI]

hazardous air pollutant removal, Proceeding of SO 2 Controlto control emissions of harmful air pollutants from electric

Rubin, Edward S.; Yeh, Sonia; Hounshell, David A; Taylor, Margaret R

2007-01-01T23:59:59.000Z

191

Control Techniques for Uncore Power Mangement in Chip Multiprocessor Designs  

E-Print Network [OSTI]

central controller that stores the collected data from each tile and performs computation based on the control algorithm (3) The communication policy for information transportation from tiles to the central controller For the critical latency based... the critical latency and uncore V/F level. This computation takes several arithmetical operations and thus can be finished very quickly. For the transportation of status information from each tile to the central controller PCU, we use a method as same as [6...

Xu, Zheng

2013-08-01T23:59:59.000Z

192

A modeling and control approach to advanced nuclear power plants with gas turbines  

Science Journals Connector (OSTI)

Abstract Advanced nuclear power plants are currently being proposed with a number of various designs. However, there is a lack of modeling and control strategies to deal with load following operations. This research investigates a possible modeling approach and load following control strategy for gas turbine nuclear power plants in order to provide an assessment way to the concept designs. A load frequency control strategy and average temperature control mechanism are studied to get load following nuclear power plants. The suitability of the control strategies and concept designs are assessed through linear stability analysis methods. Numerical results are presented on an advanced molten salt reactor concept as an example nuclear power plant system to demonstrate the validity and effectiveness of the proposed modeling and load following control strategies.

Gnyaz Ablay

2013-01-01T23:59:59.000Z

193

Modeling, control, and power management of a power electrical system including two distributed generators based on fuel cell and supercapacitor  

Science Journals Connector (OSTI)

This paper focuses on Distributed Generator (DG) integration in Power Electrical System (PES) for dispersed nodes. The main objective of the DG use can be classified into two aspects: a load following service and ancillary service systems. In this study the DG system contains a Fuel cell and a Supercapacitor storage device. A gas turbine system is modeled in order to estimate the PES frequency behavior under a variable power demand. The main goal of this work is to develop a DG control strategy with the aim to smooth the frequency and the voltage peak variations. To assess the different management stages the power flow exchanged between DGs and PES is depicted and discussed for different power demand variations. The results found with the DGs integration strategy confirm the frequency and voltage regulations and also prove the well power flow management.

L. Krichen

2013-01-01T23:59:59.000Z

194

Intelligent Control of Energy-Saving Power Generation System  

Science Journals Connector (OSTI)

Highway power generation system which is environmentally friendly and sustainable provides an innovative method of energy conversion. It is also as a kind ... solar electric generation system integration. Develop...

Zhiyuan Zhang; Guoqing Zhang; Zhizhong Guo

2013-01-01T23:59:59.000Z

195

Controller Design and Implementation for a Powered Prosthetic Knee  

E-Print Network [OSTI]

like more powerful electric motors and higher capacityleg through the use of an electric motor-driven ball-screwa torque with an electric motor even when no mechanical work

Rosa, Matthew David

2012-01-01T23:59:59.000Z

196

Genetic Algorithm Based Damage Control For Shipboard Power Systems  

E-Print Network [OSTI]

approach for future reconfigurable shipboard power systems. The methodology should be capable of representing the dynamic performance (differential algebraic description), the steady state performance (algebraic description), and the system reconfiguration...

Amba, Tushar

2010-07-14T23:59:59.000Z

197

Control strategies for supercritical carbon dioxide power conversion systems  

E-Print Network [OSTI]

The supercritical carbon dioxide (S-C02) recompression cycle is a promising advanced power conversion cycle which couples well to numerous advanced nuclear reactor designs. This thesis investigates the dynamic simulation ...

Carstens, Nathan, 1978-

2007-01-01T23:59:59.000Z

198

Analysis and synthesis of HVDC controls for robust stability of power systems  

SciTech Connect (OSTI)

High Voltage DC (HVDC) links have controllable characteristics with potential for affecting system stability. This paper follows the robustness methodology procedure to analyze the stability robustness of HVDC controls in power systems over a range of operating conditions. A novel method to design power system controllers using the robustness methodology is also proposed. Numerical results for a sample test-system are obtained and compared with those obtained by conventional techniques.

Venkataraman, S.; Khammash, M.H.; Vittal, V. [Iowa State Univ., Ames, IA (United States). Dept. of Electrical Engineering and Computer Engineering] [Iowa State Univ., Ames, IA (United States). Dept. of Electrical Engineering and Computer Engineering

1995-11-01T23:59:59.000Z

199

Development and Verification of Control and Protection Strategies in Hybrid AC/DC Power Systems for Smart Grid Applications.  

E-Print Network [OSTI]

?? Modern power networks incorporate communications and information technology infrastructure into the electrical power system to create a smart grid in terms of control and (more)

Salehi Pour Mehr, Vahid

2012-01-01T23:59:59.000Z

200

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network [OSTI]

Wind-Powered Generation Examples are: The rough running bands of hydro turbines Loadings of coal burning steam plants at which coal mills

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

International Journal of Systems Science, 2000, volume 31, number 4, pages 519 527 Multi machine power system excitation control design via theories  

E-Print Network [OSTI]

voltage direct current (HVDC) power control design and static voltage condensor (SVC) control design (Lu

Qu, Zhihua

202

A Novel Three-Phase Rectifier with Reduced THD Gregory Ivensky and Sam Ben-Yaakov  

E-Print Network [OSTI]

- directional switches (such as BJT, MOSFET, IGBT or GTO) and 24 diodes that are switched at low frequency processes within the rectifier bridges proceed instantly. Voltage waveforms of the bridges are presented

203

Analysis of three-phase rectifiers with constant-voltage loads  

E-Print Network [OSTI]

This work presents a quantitative analysis of the operating characteristics of three-phase diode bridge rectifiers with AC-side reactance and constant-voltage loads. We focus on the case where the AC-side currents vary ...

Caliskan, Vahe

204

Electrical power inverter having a phase modulated, twin-inverter, high frequency link and an energy storage module  

DOE Patents [OSTI]

The present invention provides an electrical power inverter method and apparatus, which includes a high frequency link, for converting DC power into AC power. Generally stated, the apparatus includes a first high frequency module which produces an AC voltage at a first output frequency, and a second high frequency inverter module which produces an AC voltage at a second output frequency that is substantially the same as the first output frequency. The second AC voltage is out of phase with the first AC voltage by a selected angular phase displacement. A mixer mixes the first and second output voltages to produce a high frequency carrier which has a selected base frequency impressed on the sidebands thereof. A rectifier rectifies the carrier, and a filter filters the rectified carrier. An output inverter inverts the filtered carrier to produce an AC line voltage at the selected base frequency. A phase modulator adjusts the relative angular phase displacement between the outputs of the first and second high frequency modules to control the base frequency and magnitude of the AC line voltage. 19 figs.

Pitel, I.J.

1987-02-03T23:59:59.000Z

205

Electrical power inverter having a phase modulated, twin-inverter, high frequency link and an energy storage module  

DOE Patents [OSTI]

The present invention provides an electrical power inverter method and apparatus, which includes a high frequency link, for converting DC power into AC power. Generally stated, the apparatus includes a first high frequency module which produces an AC voltage at a first output frequency, and a second high frequency inverter module which produces an AC voltage at a second output frequency that is substantially the same as the first output frequency. The second AC voltage is out of phase with the first AC voltage by a selected angular phase displacement. A mixer mixes the first and second output voltages to produce a high frequency carrier which has a selected base frequency impressed on the sidebands thereof. A rectifier rectifies the carrier, and a filter filters the rectified carrier. An output inverter inverts the filtered carrier to produce an AC line voltage at the selected base frequency. A phase modulator adjusts the relative angular phase displacement between the outputs of the first and second high frequency modules to control the base frequency and magnitude of the AC line voltage.

Pitel, Ira J. (Whippany, NJ)

1987-02-03T23:59:59.000Z

206

Power management of hybrid micro-grid system by a generic centralized supervisory control scheme  

Science Journals Connector (OSTI)

Abstract This paper presents a generic centralized supervisory control scheme for the power management of multiple power converters based hybrid micro-grid system. The system consists of wind generators, photovoltaic system, multiple parallel connected power converters, utility grid, ac and dc loads. Power management of the micro-grid is performed under two cases: grid mode and local mode. Central supervisory unit (CSU) generates command signal to ensure the power management during the two modes. In local mode, the dc loads in the acdc hybrid system can be controlled. In the case of grid mode operation, power flow between the utility grid and micro-grid is controlled. A novel feature of this paper is the incorporation of the multiple power converters. The generated command signal from the CSU can also control the operation of the multiple power converters in both grid and local modes. An additional feature is the incorporation of sodium sulfur battery energy storage system (NAS BESS) which is used to smooth the output power fluctuation of the wind farm. The effectiveness of the control scheme is also verified using real time load pattern. The simulation is performed in PSCAD/EMTDC.

Mir Nahidul Ambia; Ahmed Al-Durra; Cedric Caruana; S.M. Muyeen

2014-01-01T23:59:59.000Z

207

Microsoft PowerPoint - Module 12 - Instrumentation and Control...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

plants - I&C protection system functions and protection p y p hardware interfaces - Reliability and interpretation of regulatory criteria * Control Room and I&C architecture...

208

Power Limitation Control for a PMSG-Based Marine Current Turbine at High Tidal Speed and  

E-Print Network [OSTI]

Power Limitation Control for a PMSG-Based Marine Current Turbine at High Tidal Speed and Strong Sea Abstract--This paper deals with the control strategies for a fixed-pitch marine current turbine (MCT) when the nominal MPPT tracking speed during high speed marine currents. In the speed control strategy, the turbine

Paris-Sud XI, Université de

209

Direct Power Control of Doubly-Fed Generator Based Wind Turbine Converters to Improve Low Voltage  

E-Print Network [OSTI]

Control (DPC) is discussed for Low Voltage Ride Through (LVRT) of DFIG based wind turbine converters power integration state that doubly fed induction generator (DFIG) controllers should be capable and maintaining dc bus voltage, then the DFIG will stay online during the disturbance. A fast acting controller

Kimball, Jonathan W.

210

ARTICLE IN PRESS Controlling power systems with price signals  

E-Print Network [OSTI]

several unresolved issues: problems with linear cost structures, response delays, varying costs, market in the power system even under conditions where no information was explicitly shared by the generators. This was possible under the assumption that every generator would choose to operate any- time the price offered

Tesfatsion, Leigh

211

Efficient Power Control for Broadcast in Wireless Communication Systems  

E-Print Network [OSTI]

we focus on the determination of minimum-energy broadcast tree construction taking into consideration- proaches (Section 3), Minimum energy broadcast tree (Section 4), Broadcast incremental power (BIP) with SIR Department of Electrical Engineering, University of Texas at San Antonio, San Antonio, TX 78249 Email

Chronopoulos, Anthony T.

212

Performance of ECM controlled VAV fan powered terminal units  

E-Print Network [OSTI]

2006). The airflow and power consumption performance models had an R2 equal to 0.990 or greater for every terminal unit tested. An air leakage model was employed to account for leakage in the parallel designed VAV terminal units when the internal fan...

Cramlet, Andrew Charles

2009-05-15T23:59:59.000Z

213

Power Supply Changes for NSTX Resistive Wall Mode Coils  

SciTech Connect (OSTI)

The National Spherical Torus Experiment (NSTX) has been designed and installed in the existing facilities at Princeton Plasma Physics Laboratory (PPPL). Most of the hardware, plant facilities, auxiliary sub-systems, and power systems originally used for the Tokamak Fusion Test Reactor (TFTR) have been used with suitable modifications to reflect NSTX needs. Prior to 2004, the NSTX power system was feeding twelve (12) circuits in the machine. In 2004 the Resistive Wall Mode (RWM) Coils were installed on the machine to correct error fields. There are six of these coils installed around the machine in the mid-plane. Since these coils need fast and accurate controls, a Switching Power Amplifier (SPA) with three sub-units was procured, installed and commissioned along with other power loop components. Two RWM Coils were connected in series and fed from one SPA sub-unit. After the initial RWM campaign, operational requirements evolved such that each of the RWM coils now requires separate power and control. Hence a second SPA with three sub-units has been procured and installed. The second unit is of improved design and has the controls and power components completely isolated. The existing thyristor rectifier is used as DC Link to both of the Switching Power Amplifiers. The controls for the RWM are integrated into the overall computer control of the DC Power systems for NSTX. This paper describes the design changes in the RWM Power system for NSTX.

Ramakrishnan, S S.

2013-06-28T23:59:59.000Z

214

Control of power to an inductively heated part  

DOE Patents [OSTI]

A process for induction hardening a part to a desired depth with an AC signal applied to the part from a closely coupled induction coil includes measuring the voltage of the AC signal at the coil and the current passing through the coil; and controlling the depth of hardening of the part from the measured voltage and current. The control system determines parameters of the part that are functions of applied voltage and current to the induction coil, and uses a neural network to control the application of the AC signal based on the detected functions for each part. 6 figs.

Adkins, D.R.; Frost, C.A.; Kahle, P.M.; Kelley, J.B.; Stanton, S.L.

1997-05-20T23:59:59.000Z

215

Integrated Computing, Communication, and Distributed Control of Deregulated Electric Power Systems  

SciTech Connect (OSTI)

Restructuring of the electricity market has affected all aspects of the power industry from generation to transmission, distribution, and consumption. Transmission circuits, in particular, are stressed often exceeding their stability limits because of the difficulty in building new transmission lines due to environmental concerns and financial risk. Deregulation has resulted in the need for tighter control strategies to maintain reliability even in the event of considerable structural changes, such as loss of a large generating unit or a transmission line, and changes in loading conditions due to the continuously varying power consumption. Our research efforts under the DOE EPSCoR Grant focused on Integrated Computing, Communication and Distributed Control of Deregulated Electric Power Systems. This research is applicable to operating and controlling modern electric energy systems. The controls developed by APERC provide for a more efficient, economical, reliable, and secure operation of these systems. Under this program, we developed distributed control algorithms suitable for large-scale geographically dispersed power systems and also economic tools to evaluate their effectiveness and impact on power markets. Progress was made in the development of distributed intelligent control agents for reliable and automated operation of integrated electric power systems. The methodologies employed combine information technology, control and communication, agent technology, and power systems engineering in the development of intelligent control agents for reliable and automated operation of integrated electric power systems. In the event of scheduled load changes or unforeseen disturbances, the power system is expected to minimize the effects and costs of disturbances and to maintain critical infrastructure operational.

Bajura, Richard; Feliachi, Ali

2008-09-24T23:59:59.000Z

216

Intelligent Control of Power Electronic Systems for Wind Turbines  

Science Journals Connector (OSTI)

In this chapter, a computational strategy directed more towards intelligent behavior is employed as a tool for fast, accurate, and efficient control of PES used in double fed induction generator (DFIG) based wind...

Bharat Singh; S. N. Singh; Elias Kyriakides

2010-01-01T23:59:59.000Z

217

Power Control of a Polymer Electrolyte Membrane Fuel Cell  

Science Journals Connector (OSTI)

In addition to degrading performance (from a Nernst potential perspective), this depleted oxygen state could damage the electrocatalyst. ... Unfortunately, application of these advanced control methods will require the development of more sophisticated models, so as to reduce the model mismatch degradation resulting from the feed-forward characteristics inherent to these controllers. ... A math. model is developed to simulate the transient phenomena in a polymer electrolyte membrane fuel cell (PEMFC) system. ...

Kevin C. Lauzze; Donald J. Chmielewski

2006-05-25T23:59:59.000Z

218

E-beam high voltage switching power supply  

DOE Patents [OSTI]

A high power, solid state power supply is described for producing a controllable, constant high voltage output under varying and arcing loads suitable for powering an electron beam gun or other ion source. The present power supply is most useful for outputs in a range of about 100-400 kW or more. The power supply is comprised of a plurality of discrete switching type dc-dc converter modules, each comprising a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, and an output rectifier for producing a dc voltage at the output of each module. The inputs to the converter modules are fed from a common dc rectifier/filter and are linked together in parallel through decoupling networks to suppress high frequency input interactions. The outputs of the converter modules are linked together in series and connected to the input of the transmission line to the load through a decoupling and line matching network. The dc-dc converter modules are phase activated such that for n modules, each module is activated equally 360{degree}/n out of phase with respect to a successive module. The phased activation of the converter modules, combined with the square current waveforms out of the step up transformers, allows the power supply to operate with greatly reduced output capacitance values which minimizes the stored energy available for discharge into an electron beam gun or the like during arcing. The present power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle using simulated voltage feedback signals and voltage feedback loops. Circuitry is also provided for sensing incipient arc currents reflected at the output of the power supply and for simultaneously decoupling the power supply circuitry from the arcing load. 7 figs.

Shimer, D.W.; Lange, A.C.

1997-03-11T23:59:59.000Z

219

E-beam high voltage switching power supply  

DOE Patents [OSTI]

A high power, solid state power supply is described for producing a controllable, constant high voltage output under varying and arcing loads suitable for powering an electron beam gun or other ion source. The present power supply is most useful for outputs in a range of about 100-400 kW or more. The power supply is comprised of a plurality of discrete switching type dc-dc converter modules, each comprising a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, and an output rectifier for producing a dc voltage at the output of each module. The inputs to the converter modules are fed from a common dc rectifier/filter and are linked together in parallel through decoupling networks to suppress high frequency input interactions. The outputs of the converter modules are linked together in series and connected to the input of the transmission line to the load through a decoupling and line matching network. The dc-dc converter modules are phase activated such that for n modules, each module is activated equally 360.degree./n out of phase with respect to a successive module. The phased activation of the converter modules, combined with the square current waveforms out of the step up transformers, allows the power supply to operate with greatly reduced output capacitance values which minimizes the stored energy available for discharge into an electron beam gun or the like during arcing. The present power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle using simulated voltage feedback signals and voltage feedback loops. Circuitry is also provided for sensing incipient arc currents reflected at the output of the power supply and for simultaneously decoupling the power supply circuitry from the arcing load.

Shimer, Daniel W. (Danville, CA); Lange, Arnold C. (Livermore, CA)

1997-01-01T23:59:59.000Z

220

Energy Efficient Greedy Link Scheduling and Power Control in wireless networks  

E-Print Network [OSTI]

We consider the problem of joint link scheduling and power control for wireless networks with average transmission power constraints. Due to the high computational complexity of the optimal policies, we extend the class of greedy link scheduling policies to handle average power constraints. We develop a greedy link scheduling and power control scheme GECS, with provable performance guarantees. We show that the performance of our greedy scheduler can be characterized using the Local Pooling Factor (LPF) of a network graph, which has been previously used to characterize the stability of the Greedy Maximal Scheduling (GMS) policy for wireless networks. We also simulate the performance of GECS on wireless network, and compare its performance to another candidate greedy link scheduling and power control policy.

Sridharan, Arun

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Energy Saving System for Home Energy Measurement and Efficient Power Control  

Science Journals Connector (OSTI)

Energy Saving System (ESS) is designed and implemented for real-time home energy measurement and the efficient power control at homes or buildings. For energy saving functions and the future extension to the...

Kwang-Soon Choi; Young-Choong Park; Yang-Keun Ahn

2012-01-01T23:59:59.000Z

222

Control of a Powered AnkleFoot Prosthesis Based on a Neuromuscular Model  

E-Print Network [OSTI]

Control schemes for powered ankle-foot prostheses rely upon fixed torque-ankle state relationships obtained from measurements of intact humans walking at target speeds and across known terrains. Although effective at their ...

Geyer, Hartmut

223

Distributed series reactance: a new approach to realize grid power flow control.  

E-Print Network [OSTI]

??The objective of the proposed research is to develop a cost-effective power flow controller to improve the utilization and reliability of the existing transmission, sub-transmission, (more)

Johal, Harjeet

2008-01-01T23:59:59.000Z

224

Dynamic modeling and direct power control of wind turbine driven DFIG under unbalanced network voltage conditions  

Science Journals Connector (OSTI)

This paper proposes an analysis and a direct power control (DPC) design of a wind turbine driven doubly-fed induction generator (DFIG) under unbalanced network voltage conditions. A DFIG model described in the po...

Jia-bing Hu; Yi-kang He; Lie Xu

2008-12-01T23:59:59.000Z

225

NMS 74-6-4 Duties and Powers of the Water Quality Control Commission...  

Open Energy Info (EERE)

NMS 74-6-4 Duties and Powers of the Water Quality Control Commission Jump to: navigation, search OpenEI Reference LibraryAdd to library Legal Document- StatuteStatute: NMS 74-6-4...

226

Distributed PI-Control with Applications to Power Systems Frequency Control  

E-Print Network [OSTI]

decentralization of power transmission systems, as well as the independence of micro-grids highlight the need

Dimarogonas, Dimos

227

An expert display system and nuclear power plant control rooms  

SciTech Connect (OSTI)

An expert display system controls automatically the display of segments on a cathode ray tube's screen to form an image of plant operations. The image consists of an icon of: 1) the process (heat engine cycle), 2) plant control systems, and 3) safety systems. A set of data-driven, forward-chaining computer stored rules control the display of segments. As plant operation changes, measured plant data are processed through the rules, and the results control the deletion and addition of segments to the display format. The icon contains information needed by control rooms operators to monitor plant operations. One example of an expert display is illustrated for the operator's task of monitoring leakage from a safety valve in a steam line of a boiling water reactor (BWR). In another example, the use of an expert display to monitor plant operations during pre-trip, trip, and post-trip operations is discussed as a universal display. The viewpoints and opinions expressed herein are the author's personal ones, and they are not to be interpreted as Nuclear Regulatory Commission criteria, requirements, or guidelines.

Beltracchi, L.

1988-04-01T23:59:59.000Z

228

Numeric simulation of thyristor power converters taking into consideration the firing-circuits and the closed-loop control  

E-Print Network [OSTI]

Numeric simulation of thyristor power converters taking into consideration the firing-circuits and the closed-loop control

Bordry, Frederick; Proudlock, Paul

1988-01-01T23:59:59.000Z

229

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network [OSTI]

Undrill. 1975. "Automatic Generation Control", IEEE Tutorialfraction of generation providing response grid. The adjustment of generation, minute-by- minute, in

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

230

Management of a Smart Grid with Controlled-Delivery of Discrete Power Levels  

E-Print Network [OSTI]

Management of a Smart Grid with Controlled-Delivery of Discrete Power Levels Roberto Rojas of Technology Newark, NJ 07102 {rojas, yx63, grebel}@njit.edu Abstract--The present electrical grid uses two to power amounts. These two properties, although functional and practical, expose the grid to overload

Rojas-Cessa, Roberto

231

Design of a Control Strategy for a Fuel Cell/Battery Hybrid Power Supply  

E-Print Network [OSTI]

The purpose of this thesis is to design hardware and a control strategy for a fuel cell/battery hybrid power supply. Modern fuel cell/battery hybrid power supplies can have 2 DC/DC converters: one converter for the battery and one for the fuel cell...

Smith, Richard C.

2010-01-14T23:59:59.000Z

232

Scenario-Based Fault-Tolerant Model Predictive Control for Diesel-Electric Marine Power Plant  

E-Print Network [OSTI]

Scenario-Based Fault-Tolerant Model Predictive Control for Diesel-Electric Marine Power Plant where diesel gener- ator sets (a diesel engine connected to a generator) produce electrical power, which Email: torstein.bo@itk.ntnu.no, tor.arne.johansen@itk.ntnu.no Abstract--Diesel-electric propulsion

Johansen, Tor Arne

233

Ris-R-1117(EN) Power Control for Wind Turbines in  

E-Print Network [OSTI]

Risø-R-1117(EN) Power Control for Wind Turbines in Weak Grids: Project summary Henrik Bindner (Ed in Europe large areas exist where the wind resources are good or very good and the grid is relatively weak for the exploitation of the wind resource. There are two main problems concerned with wind power and weak grids

234

Software Controlled Power Management Yung-Hsiang Lu, Tajana Simunic, Giovanni De Micheli  

E-Print Network [OSTI]

Software Controlled Power Management Yung-Hsiang Lu, Tajana Simuni´c, Giovanni De Micheli Computer in either hardware or software. A recent trend on personal computers is to use software to change hardware power states. This paper presents a software architecture that allows system designers to in- vestigate

Simunic, Tajana

235

Fuzzy Based Energy Management Control of A Hybrid Fuel Cell Auxiliary Power System  

E-Print Network [OSTI]

battery auxiliary power unit (APU) for remote applications where a fuel cell is the main energy source for decentralized or distributed energy production, such as telecom, remote sites or even for military applicationsFuzzy Based Energy Management Control of A Hybrid Fuel Cell Auxiliary Power System M. Godoy Simões1

Simões, Marcelo Godoy

236

A Predictive power control of Doubly Fed Induction Generator for Wave Energy Converter  

E-Print Network [OSTI]

using a linearized state- space model. The DFIG-based WEC power tracking performances further converter (WEC), irregular wave, doubly-fed induction generator (DFIG), predictive power control, I rotational motion for connection to a conventional rotating electrical generator as a DFIG (Fig. 1). Fig.1

Brest, Université de

237

Self-Optimization in Mobile Cellular Networks: Power Control and User Association  

E-Print Network [OSTI]

Self-Optimization in Mobile Cellular Networks: Power Control and User Association Chung Shue Chen develop mathematical and algorith- mic tools for the self-optimization of mobile cellular networks the wireless devices are proposed. We focus on the optimization of transmit power and of user association

Paris-Sud XI, Université de

238

Power Smoothing Control in a Grid-Connected Marine Current Turbine System for Compensating  

E-Print Network [OSTI]

Power Smoothing Control in a Grid-Connected Marine Current Turbine System for Compensating Swell d-axis and q-axis inductances g, g Grid inductance and resistance Pole pair number R Turbine blade-axis and q-axis voltages Turbine and generator power difference , g Rotor position, grid voltage angle

Boyer, Edmond

239

3484 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 12, NO. 7, JULY 2013 Joint Back-Pressure Power Control and Interference  

E-Print Network [OSTI]

Gopalakrishnan and Nicholas D. Sidiropoulos, Fellow, IEEE Abstract--Back-Pressure Power Control (BPPC) is a cross control and interference cancellation are tightly coupled. This leads to a joint Back- Pressure Power, back- pressure, power control, interference cancellation, NP-hard, con- vex approximation. I

Sidiropoulos, Nikolaos D.

240

Modeling and control of a PowerSail  

E-Print Network [OSTI]

connected to a host satellite by a pair of hollow links housing an electrical conductor. The mechanism connecting the sail and the host consists of seven active joints. This thesis addresses the modeling of the system dynamics and the design of control laws...

Naik, Kishore Shivdas

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Empirical Analysis of Transmission Power Control Algorithms for Wireless  

E-Print Network [OSTI]

#12;Using Sensor Networks for Real World · Industrial applications (e.g. HVAC, building control not filter the nodes of bad link quality. · Packet Reception Rate (PRR) ­ Filter the neighbors based on PRR. ­ Filter the neighbors based on received signal strength. ­ With hardware assistance, it can determine link

California at Berkeley, University of

242

Cooperative Congestion Control in Power Grid Communication Networks  

E-Print Network [OSTI]

for the delivery of Phasor Measurement Unit(PMU) [1] sensor data with real time guarantees to the control centers for timely decisions. Present day network systems are unable to ensure real-time needs of the PMU data for PMU data and to respond if transient deviations in real-time PMU network traffic occur. The frame

Nahrstedt, Klara

243

Transient stability and control of renewable generators based on Hamiltonian surface shaping and power flow control. Part II, analysis.  

SciTech Connect (OSTI)

The swing equations for renewable generators connected to the grid are developed and a wind turbine is used as an example. The swing equations for the renewable generators are formulated as a natural Hamiltonian system with externally applied non-conservative forces. A two-step process referred to as Hamiltonian Surface Shaping and Power Flow Control (HSSPFC) is used to analyze and design feedback controllers for the renewable generators system. This formulation extends previous results on the analytical verification of the Potential Energy Boundary Surface (PEBS) method to nonlinear control analysis and design and justifies the decomposition of the system into conservative and non-conservative systems to enable a two-step, serial analysis and design procedure. The first step is to analyze the system as a conservative natural Hamiltonian system with no externally applied non-conservative forces. The Hamiltonian surface of the swing equations is related to the Equal-Area Criterion and the PEBS method to formulate the nonlinear transient stability problem. This formulation demonstrates the effectiveness of proportional feedback control to expand the stability region. The second step is to analyze the system as natural Hamiltonian system with externally applied non-conservative forces. The time derivative of the Hamiltonian produces the work/rate (power flow) equation which is used to ensure balanced power flows from the renewable generators to the loads. The Second Law of Thermodynamics is applied to the power flow equations to determine the stability boundaries (limit cycles) of the renewable generators system and enable design of feedback controllers that meet stability requirements while maximizing the power generation and flow to the load. Necessary and sufficient conditions for stability of renewable generators systems are determined based on the concepts of Hamiltonian systems, power flow, exergy (the maximum work that can be extracted from an energy flow) rate, and entropy rate. This paper will present the analysis and numerical simulation results for two nonlinear control design examples that include: (1) the One-Machine Infinite Bus (OMIB) system with a Unified Power Flow Controller (UPFC) and (2) the swing equation for a wind turbine connected to an infinite bus through a UPFC to determine the required performance of the UPFC to enable the maximum power output of a wind turbine subject to stochastic inputs while meeting the power system constraints on frequency and phase. The energy storage requirements will also be identified from the UPFC and/or FACTS devices while working in combination with the wind turbine.

Robinett, Rush D., III; Wilson, David Gerald

2010-11-01T23:59:59.000Z

244

OVERVIEW OF A RECONFIGURABLE SIMULATOR FOR MAIN CONTROL ROOM UPGRADES IN NUCLEAR POWER PLANTS  

SciTech Connect (OSTI)

This paper provides background on a reconfigurable control room simulator for nuclear power plants. The main control rooms in current nuclear power plants feature analog technology that is growing obsolete. The need to upgrade control rooms serves the practical need of maintainability as well as the opportunity to implement newer digital technologies with added functionality. There currently exists no dedicated research simulator for use in human factors design and evaluation activities for nuclear power plant modernization in the U.S. The new research simulator discussed in this paper provides a test bed in which operator performance on new control room concepts can be benchmarked against existing control rooms and in which new technologies can be validated for safety and usability prior to deployment.

Ronald L. Boring

2012-10-01T23:59:59.000Z

245

Control of CO2 emission through enhancing energy efficiency of auxiliary power equipment in thermal power plant  

Science Journals Connector (OSTI)

Abstract This paper describes the results of energy efficiency enhancement in 23 numbers of 210MW coal fired power plants spread over India. Energy efficiency improvement of major auxiliary equipment with different plant load factors are summarized here with improved performance. The effect of plant load factor on all major auxiliary equipment and improvement in performance of auxiliary equipment are discussed in this paper. Operation of the plant at improved plant load factor reduced the specific auxiliary power from 11.23% at 70% PLF to 8.74% at 100% PLF that reduced the net auxiliary power by 9.1MU/year that is an equivalent reduction of CO2 emission by 9500t/year. Optimizing the excess air, controlling the furnace ingress, enhanced energy efficiency of individual equipment by proper maintenance, etc., improves the plant capacity and reduces the overall auxiliary power by about 1.52.1% of gross energy generation i.e., equivalent CO2 reduction of 23,00032,400t/year and release an additional power of about 3.5MW (for a typical one 210MW power plant) into grid.

Rajashekar P. Mandi; Udaykumar R. Yaragatti

2014-01-01T23:59:59.000Z

246

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network [OSTI]

pressure controller of a steam turbine. For the purpose ofthe response of steam turbines to governing action: R = 0.05cycle plants. The steam turbines of these plants are most

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

247

Modeling and improvement of direct power control of DFIG under unbalanced grid voltage condition  

Science Journals Connector (OSTI)

Abstract This paper presents analysis and control of a doubly-fed induction generator (DFIG)-based wind generation system operating under unbalanced grid voltage condition. The DFIG system is modeled in synchronous positive reference frame. System behavior and operation of both the generator and the grid side converter (GSC) under unbalanced condition is illustrated by definition of oscillating power terms in the synchronous reference frame. This analysis makes it possible to control both the active and reactive power generation by means of direct power control (DPC) technique. It is shown that considering the DFIG model in synchronous reference frame simplifies the power terms extraction. Moreover, alternative DFIG control targets such as reducing unbalanced stator current, torque and power pulsations minimization, are considered. In addition, by the proposed method, the oscillation of the stator output power is compensated by the GSC, to ensure constant power output from the overall DFIG generation system. The validation of results has been performed through simulation results on a 2MW DFIG wind generation system.

Mohammad Jafar Zandzadeh; Abolfazl Vahedi

2014-01-01T23:59:59.000Z

248

Improved Power Control in the Palm of Your Hand | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Improved Power Control in the Palm of Your Hand Improved Power Control in the Palm of Your Hand Improved Power Control in the Palm of Your Hand November 7, 2011 - 2:11pm Addthis Silicon carbide thyristors, developed through a partnership between the Energy Department's Sandia National Lab and GeneSiC Semiconductor, are key to utility-scale power conversion. Learn more about this technology, which won a 2011 R&D 100 award. Dr. Imre Gyuk Dr. Imre Gyuk Energy Storage Program Manager, Office of Electricity Delivery and Energy Reliability How does it work? The GeneSic thyristor -- an electronic switch -- is based on on silicon carbide (SiC), which can operate at much higher temperatures than silicon. This allows the device to handle 10 times the voltage, and switch 100 times faster, than its silicon-based competition.

249

Digitally Controlled Wide Range Pulse Width Modulator for On-Chip Power Supplies  

E-Print Network [OSTI]

of the inverters This research is supported in part by the New York State Office of Science, TechnologyDigitally Controlled Wide Range Pulse Width Modulator for On-Chip Power Supplies Selc¸uk K Rochester, New York 14627 fvaisband, friedmang@ece.rochester.edu Abstract-- A digitally controlled current

Friedman, Eby G.

250

A power control strategy for flywheel doubly-fed induction machine storage system using artificial neural network  

Science Journals Connector (OSTI)

A large-capacity low-speed flywheel energy storage system (FESS) based on a doubly-fed induction machine (DFIM) consists of a wound-rotor induction machine and a back-to-back converter rated at 3035% of the machine power rating used for rotor excitation. This system has been promoted as a viable mean of energy storage for power system applications as grid frequency support/control, uninterruptible power supply (UPS), power conditioning, and voltage sag mitigation. This paper presents a simple power control strategy based on artificial neural networks (ANN) to charge/discharge a flywheel DFIM (FW-DFIM) storage system while maintaining controllable grid side power. The proposed controller is based on conventional vector control system supplemented by an ANN-based current decoupling network used to develop the required rotor current components based on the required grid power level and flywheel instantaneous speed. The controller is designed to avoid overloading both stator and rotor circuits while the flywheel is charged/discharged. Additionally, it avoids using the required outer power loop or a hysteresis power controller, hence, simplifies the overall control algorithm. The validity of the developed concept along with the effectiveness and viability of the control strategy in power system applications is confirmed by computer simulation using Matlab/Simulink for a medium voltage 1000hp FW-DFIM. The simulation study is carried out for uninterruptible power supply (UPS) applications and power leveling to improve the quality of electric power delivered by wind generators.

A. Abdel-Khalik; A. Elserougi; A. Massoud; S. Ahmed

2013-01-01T23:59:59.000Z

251

Implementing agent-based emissions trading for controlling Virtual Power Plant emissions  

Science Journals Connector (OSTI)

Abstract A methodology was developed and tested for controlling the emissions from a group of micro-generators aggregated in a Virtual Power Plant. The methodology is based on the EU Emissions Trading Scheme. A multi-agent system was designed and simulations were performed. The operation of the system was demonstrated experimentally using micro-generation sources installed in two laboratories. Two days of experiments were performed. Results show that system emissions have been controlled with a good accuracy, since only small deviations between desired and actual emissions output were observed. It was found that Virtual Power Plant controllability increases significantly by increasing the number of participating micro-generators.

Spyros Skarvelis-Kazakos; Evangelos Rikos; Efstathia Kolentini; Liana M. Cipcigan; Nick Jenkins

2013-01-01T23:59:59.000Z

252

Control system and method for a power delivery system having a continuously variable ratio transmission  

DOE Patents [OSTI]

A control system and method for a power delivery system, such as in an automotive vehicle, having an engine coupled to a continuously variable ratio transmission (CVT). Totally independent control of engine and transmission enable the engine to precisely follow a desired operating characteristic, such as the ideal operating line for minimum fuel consumption. CVT ratio is controlled as a function of commanded power or torque and measured load, while engine fuel requirements (e.g., throttle position) are strictly a function of measured engine speed. Fuel requirements are therefore precisely adjusted in accordance with the ideal characteristic for any load placed on the engine.

Frank, Andrew A. (1034 Hillside Ave., Madison, WI 53705)

1984-01-01T23:59:59.000Z

253

Agent based control of power systems, ForskEL (Smart Grid Project) | Open  

Open Energy Info (EERE)

Agent based control of power systems, ForskEL (Smart Grid Project) Agent based control of power systems, ForskEL (Smart Grid Project) Jump to: navigation, search Project Name Agent based control of power systems, ForskEL Country Denmark Coordinates 56.26392°, 9.501785° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":56.26392,"lon":9.501785,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

254

220 kV SSSC device for power flow control (Smart Grid Project) | Open  

Open Energy Info (EERE)

kV SSSC device for power flow control (Smart Grid Project) kV SSSC device for power flow control (Smart Grid Project) Jump to: navigation, search Project Name 220 kV SSSC device for power flow control Country Spain Headquarters Location Catalonia, Spain Coordinates 41.59116°, 1.520862° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.59116,"lon":1.520862,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

255

PRECISION CURRENT SOURCE OF THE INVERTER TYPE VCH-3000-12 TO POWER MAGNETIC SYSTEMS OF ACCELERATORS AND CHARGED  

E-Print Network [OSTI]

PRECISION CURRENT SOURCE OF THE INVERTER TYPE VCH-3000-12 TO POWER MAGNETIC SYSTEMS OF ACCELERATORS, with the help of fans placed on the front boards of the Inverter and Rectifier units. Figure 1 shows through the Inverter, Rectifier, LC filter (the resonance frequency is 800 Hz) and the correction circuit

Kozak, Victor R.

256

Control scheme for power modulation of a free piston Stirling engine  

SciTech Connect (OSTI)

This patent describes a control system for power modulation of a free piston Stirling engine. It comprises: a receiver adapted to absorb solar energy and to convert the solar energy into thermal energy; a power module comprising a displacer type free piston Stirling engine having power and displacer pistons, and a linear alternator connected to the engine, the power module adapted to receive and to convert the thermal energy into electrical energy; a utility grid adapted to receive the electrical energy from the power module; an autotransformer connected in series between the linear alternator and the grid, the autotransformer being connected by feedback means to the receiver so that a change in solar insolation to the receiver varies the autotransformer turns ratio thus changing the linear alternator's terminal voltage and changing power piston and displacer piston amplitude accordingly to maintain a high engine efficiency cycle over a large operating range for solar insolation absorbed by the receiver.

Dhar, M.

1989-10-17T23:59:59.000Z

257

Control of offshore marine substation for grid-connection of a wave power farm  

Science Journals Connector (OSTI)

Abstract To grid-connect an offshore wave power farm, an intermediate marine substation is suggested. As a part of the Uppsala University wave power project, a marine substation has been designed, assembled and deployed at sea. The substation is capable of connecting up to seven wave energy converters (WECs), and to transfer the power to the onshore 1kV-grid. In this article, the control procedure for grid connection of the \\{WECs\\} is described step-by-step, and the practical implementations are presented. The system is designed with autonomous control and will connect or disconnect the WECs, depending on the sea state. Fault handling is taken into account, and grid power quality such as harmonic distortion and flicker are considered in the design. Experimental results are presented to verify the system functionalities.

Rickard Ekstrm; Mats Leijon

2014-01-01T23:59:59.000Z

258

Real-Time Power Control of Data Centers for Providing Regulation Service  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Real-Time Power Control of Data Centers for Providing Regulation Service Real-Time Power Control of Data Centers for Providing Regulation Service Speaker(s): Ayse K. Coskun Date: November 19, 2013 - 12:00pm - 1:00pm Location: 90-3122 Seminar Host/Point of Contact: Girish Ghatikar Today's US power markets offer new opportunities for the energy consumers to reduce their energy costs by first promising an average consumption rate for the next hour and then by following a regulation signal broadcast by the independent system operators (ISOs), who need to match supply and demand in real time in presence of volatile and intermittent renewable energy generation. This talk proposes a management framework for the data centers to participate in the power markets. First, I will discuss how to solve the data center "regulation service (RS)" optimization problem to

259

Direct active and reactive power control of 3-level NPC-fed DFIG considering power ripple minimisation  

Science Journals Connector (OSTI)

Despite the advantages of three-level neutral point clamp (NPC) converters compared with standard voltage source inverters (VSIs), most of the direct power control (DPC) strategies for doubly fed induction generator (DFIG) reported in the literature, only utilise VSIs. As regards three-level NPC converter generates higher number of voltage vectors compared with standard VSIs, This paper presents a DPC strategy for DFIG using three-level NPC converters in which three-level NPC voltage vectors are employed to reduce large power ripples of conventional DPC. Therefore, a new optimised switching table is derived. Using this table, DFIG provides not only elaborate active and reactive powers which track their reference values very well, but also large power ripple is compensated. Also, because of ripple reduction, total harmonic distortion of rotor current, stator current, stator voltage and grid line-to-line voltage is reduced in proposed strategy compared with conventional DPC. Simulation results show the effectiveness of proposed method and have a reasonable correspondence with theoretical and mathematical analysis.

Milad Yousefi-Talouki; Parviz Ramezanpour

2014-01-01T23:59:59.000Z

260

Optimal tracking and robust power control of the DFIG wind turbine  

Science Journals Connector (OSTI)

In the present paper, an optimal operation of a grid-connected variable speed wind turbine equipped with a Doubly Fed Induction Generator (DFIG) is presented. The proposed cascaded nonlinear controller is designed to perform two main objectives. In the outer loop, a maximum power point tracking (MPPT) algorithm based on fuzzy logic theory is designed to permanently extract the optimal aerodynamic energy, whereas in the inner loop, a second order sliding mode control (2-SM) is applied to achieve smooth regulation of both stator active and reactive powers quantities. The obtained simulation results show a permanent track of the MPP point regardless of the turbine power-speed slope moreover the proposed sliding mode control strategy presents attractive features such as chattering-free, compared to the conventional first order sliding technique (1-SM).

S. Abdeddaim; A. Betka

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Evaluation of operational control strategies applicable to solar chimney power plants  

SciTech Connect (OSTI)

Numerical simulations are carried out to study the performance of two schemes of power output control applicable to solar chimney power plants. Either the volume flow or the turbine pressure drop is used as independent control variable. Values found in the literature for the optimum ratio of turbine pressure drop to pressure potential vary between 2/3 and 0.97. It is shown that the optimum ratio is not constant during the whole day and it is dependent of the heat transfer coefficients applied to the collector. This study is a contribution towards understanding solar chimney power plant performance and control and may be useful in the design of solar chimney turbines. (author)

Bernardes, Marco Aurelio dos Santos [Department of Mechanical Engineering, Centro Federal de Educacao Tecnologica de Minas Gerais - CEFET-MG, Av. Amazonas, 7675, Nova Gameleira, 30510-000 Belo Horizonte, MG (Brazil); von Backstroem, Theodor W. [Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602 (South Africa)

2010-02-15T23:59:59.000Z

262

Control scheme for power modulation of a free piston Stirling engine  

SciTech Connect (OSTI)

The present invention relates to a control scheme for power modulation of a free-piston Stirling engine-linear alternator power generator system. The present invention includes connecting an autotransformer in series with a tuning capacitance between a linear alternator and a utility grid to maintain a constant displacement to piston stroke ratio and their relative phase angle over a wide range of operating conditions.

Dhar, Manmohan (Schenectady, NY)

1989-01-01T23:59:59.000Z

263

Discrete sliding mode control strategy for direct real and reactive power regulation of wind driven DFIG  

Science Journals Connector (OSTI)

Abstract This paper investigates a discrete sliding mode control (DSMC) strategy for direct real and reactive power regulation for wind driven doubly fed induction generator (DFIG). The real and reactive power errors are eliminated by directly calculating the rotor control voltages through DSMC. In the stator stationary reference frame, direct real and reactive power control strategy is implemented. Therefore, it does not require the angular information of the stator and rotor currents or voltages. It does not involve any extra current loops which results into simple design. The use of constant converter switching frequency via space vector pulse width modulation eases the AC harmonic filter design and improves the power quality. The use of fast and flexible discrete controller makes the system competent with modern digital world. Detailed simulations have been carried out to validate the method. The simulation results reveal that the real and reactive power references are followed smoothly even in the presence of speed perturbations and performance of the system is robust against parameter variations and system disturbances.

V.N. Pande; U.M. Mate; Shailaja Kurode

2013-01-01T23:59:59.000Z

264

Coal-fired power generation: Proven technologies and pollution control systems  

SciTech Connect (OSTI)

During the last two decades, significant advances have been made in the reduction of emissions from coal-fired power generating plants. New technologies include better understanding of the fundamentals of the formation and destruction of criteria pollutants in combustion processes (low nitrogen oxides burners) and improved methods for separating criteria pollutants from stack gases (FGD technology), as well as efficiency improvements in power plants (clean coal technologies). Future demand for more environmentally benign electric power, however, will lead to even more stringent controls of pollutants (sulphur dioxide and nitrogen oxides) and greenhouse gases such as carbon dioxide.

Balat, M. [University of Mah, Trabzon (Turkey)

2008-07-01T23:59:59.000Z

265

Supervisory Power Management Control Algorithms for Hybrid Electric Vehicles: A Survey  

SciTech Connect (OSTI)

The growing necessity for environmentally benign hybrid propulsion systems has led to the development of advanced power management control algorithms to maximize fuel economy and minimize pollutant emissions. This paper surveys the control algorithms for hybrid electric vehicles (HEVs) and plug-in HEVs (PHEVs) that have been reported in the literature to date. The exposition ranges from parallel, series, and power split HEVs and PHEVs and includes a classification of the algorithms in terms of their implementation and the chronological order of their appearance. Remaining challenges and potential future research directions are also discussed.

Malikopoulos, Andreas [ORNL

2014-01-01T23:59:59.000Z

266

CONCEPTUAL DESIGN AND OPTIMAL POWER CONTROL STRATEGY FOR AN ECO?FRIENDLY HYBRID VEHICLE  

Science Journals Connector (OSTI)

This paper presents a new concept for a hybrid vehicle using a torque and speed splitting technique. It is implemented by the newly developed controller in combination with a two degree of freedom epicyclic gear transmission. This approach enables optimization of the power split between the less powerful electrical motor and more powerful engine while driving a car load. The power split is fundamentally a dual?energy integration mechanism as it is implemented by using the epicyclic gear transmission that has two inputs and one output for a proper power distribution. The developed power split control system manages the operation of both the inputs to have a known output with the condition of maintaining optimum operating efficiency of the internal combustion engine and electrical motor. This system has a huge potential as it is possible to integrate all the features of hybrid vehicle known to?date such as the regenerative braking system series hybrid parallel hybrid series/parallel hybrid and even complex hybrid (bidirectional). By using the new power split system it is possible to further reduce fuel consumption and increase overall efficiency.

N. Mir Nasiri; Frederick T. A. Chieng

2011-01-01T23:59:59.000Z

267

Power calculations D.A. Freedman December 2007 What is the power of a randomized controlled experiment? We assume there are n1 + n2  

E-Print Network [OSTI]

Power calculations D.A. Freedman December 2007 What is the power of a randomized controlled of the null against the alternative µ1 = µ2, and we compute power at µ1 = µ2 + k where k > 0 is chosen so is asymptotically distributed as N(k, 1), where k = k/f Suppose k > 2. If Z is N(0, 1), asymptotic power is then P

Sekhon, Jasjeet S.

268

Power Supplies for TESLA Modulators Hans-Jrg Eckoldt, Niels Heidbrook  

E-Print Network [OSTI]

....................................................................................................10 5.4 SCR supply with diode rectifier...................................................................................11 5.4.1 SCR bridge with single phase control..................................................................12 5.4.2 SCR bridge with sequential phase control

269

Nonlinear power flow control applications to conventional generator swing equations subject to variable generation.  

SciTech Connect (OSTI)

In this paper, the swing equations for renewable generators are formulated as a natural Hamiltonian system with externally applied non-conservative forces. A two-step process referred to as Hamiltonian Surface Shaping and Power Flow Control (HSSPFC) is used to analyze and design feedback controllers for the renewable generator system. This formulation extends previous results on the analytical verification of the Potential Energy Boundary Surface (PEBS) method to nonlinear control analysis and design and justifies the decomposition of the system into conservative and non-conservative systems to enable a two-step, serial analysis and design procedure. In particular, this approach extends the work done by developing a formulation which applies to a larger set of Hamiltonian Systems that has Nearly Hamiltonian Systems as a subset. The results of this research include the determination of the required performance of a proposed Flexible AC Transmission System (FACTS)/storage device to enable the maximum power output of a wind turbine while meeting the power system constraints on frequency and phase. The FACTS/storage device is required to operate as both a generator and load (energy storage) on the power system in this design. The Second Law of Thermodynamics is applied to the power flow equations to determine the stability boundaries (limit cycles) of the renewable generator system and enable design of feedback controllers that meet stability requirements while maximizing the power generation and flow to the load. Necessary and sufficient conditions for stability of renewable generators systems are determined based on the concepts of Hamiltonian systems, power flow, exergy (the maximum work that can be extracted from an energy flow) rate, and entropy rate.

Robinett, Rush D., III; Wilson, David Gerald

2010-05-01T23:59:59.000Z

270

End-use load control for power system dynamic stability enhancement  

SciTech Connect (OSTI)

Faced with the prospect of increasing utilization of the transmission and distribution infrastructure without significant upgrade, the domestic electric power utility industry is investing heavily in technologies to improve network dynamic performance through a program loosely referred to as Flexible AC Transmission System (FACTS). Devices exploiting recent advances in power electronics are being installed in the power system to offset the need to construct new transmission lines. These devices collectively represent investment potential of several billion dollars over the next decade. A similar development, designed to curtail the peak loads and thus defer new transmission, distribution, and generation investment, falls under a category of technologies referred to as demand side management (DSM). A subset of broader conservation measures, DSM acts directly on the load to reduce peak consumption. DSM techniques include direct load control, in which a utility has the ability to curtail specific loads as conditions warrant. A novel approach has been conceived by Pacific Northwest National Laboratory (PNNL) to combine the objectives of FACTS and the technologies inherent in DSM to provide a distributed power system dynamic controller. This technology has the potential to dramatically offset major investments in FACTS devices by using direct load control to achieve dynamic stability objectives. The potential value of distributed versus centralized grid modulation has been examined by simulating the western power grid under extreme loading conditions. In these simulations, a scenario is analyzed in which active grid stabilization enables power imports into the southern California region to be increased several hundred megawatts beyond present limitations. Modeling results show distributed load control is up to 30 percent more effective than traditional centralized control schemes in achieving grid stability.

Dagle, J.E.; Winiarski, D.W.; Donnelly, M.K.

1997-02-01T23:59:59.000Z

271

A Versatile and Powerful Simulator for Design, Advanced Control and Expert Systems  

E-Print Network [OSTI]

and powerful steady state simulator which has been satisfactorily applied to both on-line and off-line applications for plant utility and other process systems. Designated as MASSBAL MK II, the simulator has a unique architecture, menu/and or graphic... optimization Process synthesis Start-up,shut-down,on-line changes Training Debugging, trouble-shooting and monitoring Control Plantwide control, scheduling and Economic management [1] MASSBAL MK II was developed over a two-year period by SACDA...

Schindler, H. E.; Leaver, E. W.; Shewchuk, C. F.

272

A fast chiller power demand response control strategy for buildings connected to smart grid  

Science Journals Connector (OSTI)

Abstract With the increasing integration of renewable energies into electrical grids, power imbalance has become one of the most critical issues in grid operations. The end-users at power demand side can actually make use of their demand reduction potentials to contribute to the grid power balance. Conventional demand responses of end-users can provide considerable power demand reductions, but the demand responses are usually subject to significant delay and cannot fulfill the needs of grid real time operation. In this paper, a fast chiller power demand response control strategy for commercial buildings is therefore proposed which facilitates buildings to act as grid operating reserves by providing rapid demand responses to grid request within minutes. However, simply shutting down some essential operating chillers would result in disordered chilled water flow distribution and uneven indoor thermal comfort degradation. This strategy has therefore taken essential measures to solve such problems effectively. Simulation case studies are conducted to investigate the operation dynamics and energy performance of HVAC systems in the demand response events controlled by the strategy. Results show that fast and significant power demand reductions can be achieved without sacrificing the thermal comfort too much.

Xue Xue; Shengwei Wang; Chengchu Yan; Borui Cui

2015-01-01T23:59:59.000Z

273

Application of novel adaptive control of STATCOM in wind power generation  

Science Journals Connector (OSTI)

During the last years the amount of installed wind power has continued increased. The impact of wind generation on the electrical system should be assessed to figure out potential hazards to system operation and decreasing of quality, stability and reliability ... Keywords: FACT device, STATCOM, SVC, adaptive control, induction generator, wind generation

Nikolay Djagarov; Zhivko Grozdev; Milen Bonev; Stefan Filchev

2010-07-01T23:59:59.000Z

274

Automated Recurrent Neural Network Design of a Neural Controller in a Custom Power Device  

Science Journals Connector (OSTI)

A general purpose implementation of the Tabu Search metaheuristic, called Universal Tabu Search, is used to optimally design a Locally Recurrent Neural Network architecture. Indeed, the design of a neural network is a tedious and time consuming trial ... Keywords: custom power protection device, neural controller, recurrent neural networks, universal Tabu Search

B. Cannas; G. Celli; A. Fanni; F. Pilo

2001-05-01T23:59:59.000Z

275

A STOCHASTIC OPTIMAL CONTROL APPROACH FOR POWER MANAGEMENT IN PLUG-IN HYBRID ELECTRIC VEHICLES  

E-Print Network [OSTI]

A STOCHASTIC OPTIMAL CONTROL APPROACH FOR POWER MANAGEMENT IN PLUG-IN HYBRID ELECTRIC VEHICLES.e., the engine and electric machines) in a plug-in hybrid electric vehicle (PHEV). Existing studies focus mostly. INTRODUCTION This paper examines plug-in hybrid electric vehicles (PHEVs), i.e., automobiles that can extract

Krstic, Miroslav

276

Using Variable-Range Transmission Power Control in Wireless Ad Hoc Networks  

E-Print Network [OSTI]

Using Variable-Range Transmission Power Control in Wireless Ad Hoc Networks Javier Gomez and Andrew networks such as ad hoc and sensor networks. First, using previous work by Steele [18], we show that in this paper highlight the need to design future MAC and routing protocols for wireless ad hoc and sensor

Gomez-Castellanos, Javier

277

Model predictive control of power plant superheater comparison of multi model and nonlinear approaches  

E-Print Network [OSTI]

, the responses to large load demand changes (between 50 and 100% of boiler rated power) typical of today variables and control loops is high and many sources of nonlinearity and interactions are present. This increases the plant efficiency because efficiency is proportional to the superheated steam temperature

Johansen, Tor Arne

278

Power-Aware Control Speculation through Selective Throttling Juan L. Aragn1  

E-Print Network [OSTI]

Power-Aware Control Speculation through Selective Throttling Juan L. Aragón1 , José González2-aware techniques (fetch throttling, decode throttling or disabling the selection logic). The particular set fetch bandwidth reduction along with select logic disabling provides the best performance both in terms

Gupta, Rajiv

279

Trait, state or artefact? Assessing experts' regulatory focus in nuclear power plant control  

Science Journals Connector (OSTI)

We apply the theory of regulatory focus in the field of nuclear power plant (NPP) control. The first pilot study was conducted at the German simulator centre for NPPs. Here, we tested the influence of accident training lessons on the experts' regulatory ... Keywords: Experts, Human factors, Nuclear, Regulatory focus, Self-report measures

Johannes Beck, Armin Eichinger, Klaus Bengler

2014-11-01T23:59:59.000Z

280

ANEWFRAMEWORK FOR POWER CONTROL IN WIRELESS DATA NETWORKS: GAMES, UTILITY, AND PRICING  

E-Print Network [OSTI]

David Famolari Wireless Information Network Laboratory (WINLAB) Dept. of Electrical and Computer@winlab.rutgers.edu David Goodman Wireless Information Network Laboratory (WINLAB) Dept. of Electrical and ComputerChapter 1 ANEWFRAMEWORK FOR POWER CONTROL IN WIRELESS DATA NETWORKS: GAMES, UTILITY, AND PRICING

Mandayam, Narayan

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Voltage Control of Distribution Networks with Distributed Generation using Reactive Power  

E-Print Network [OSTI]

Voltage Control of Distribution Networks with Distributed Generation using Reactive Power. Nasiruzzaman Abstract--Voltage profile of distribution networks with dis- tributed generation are affected significantly due to the integra- tion of distributed generation (DG) on it. This paper presents a way

Pota, Himanshu Roy

282

Joint optimization algorithm for network reconfiguration and reactive power control of wind farm in distribution system  

Science Journals Connector (OSTI)

In recent years, the number of small size wind farms used as DG sources located within the distribution system are rapidly increasing. Wind farm made up with doubly fed induction generators (DFIG) is proposed in this paper as the continuous reactive ... Keywords: DFIG wind turbine, network reconfiguration, particle swarm optimization, reactive power control, wind farm

Jingjing Zhao; Xin Li; Jiping Lu; Congli Zhang

2009-02-01T23:59:59.000Z

283

Energy 32 (2007) 406417 Modeling and control of a SOFC-GT-based autonomous power system  

E-Print Network [OSTI]

, Norway b SINTEF ICT, 7465 Trondheim, Norway c Department of Energy and Process Engineering, NorwegianEnergy 32 (2007) 406­417 Modeling and control of a SOFC-GT-based autonomous power system Rambabu University of Science and Technology, Trondheim, 7491, Norway Received 31 October 2005 Abstract

Foss, Bjarne A.

284

Optimizing the Output of a Human-Powered Energy Harvesting System with Miniaturization and Integrated Control  

E-Print Network [OSTI]

1 Optimizing the Output of a Human-Powered Energy Harvesting System with Miniaturization mechanical energy from human foot-strikes and explore its configuration and control towards optimized energy output. Dielectric Elastomers (DEs) are high-energy density, soft, rubber-like material

Potkonjak, Miodrag

285

Power-control based scheduling for commercial transatlantic flights Husam Fahmi, Seowoo Jang and Saewoong Bahk  

E-Print Network [OSTI]

Power-control based scheduling for commercial transatlantic flights Husam Fahmi, Seowoo Jang the flight times/pattern of transatlantic flight to provide an efficient transmission schedule for all nodes in the introduction, this paper focuses on improving connectivity for transatlantic flights. Transatlantic flights

Bahk, Saewoong

286

HVDC Control Strategies to Improve Transient Stability in Interconnected Power Systems  

E-Print Network [OSTI]

HVDC Control Strategies to Improve Transient Stability in Interconnected Power Systems J. Hazra Dpt of Li`ege, Belgium, dernst@ulg.ac.be Abstract--This paper presents three HVDC modulation strate- gies flow settings through the HVDC-links. The proposed techniques are tested on the IEEE 24-Bus reliability

Boyer, Edmond

287

Chance Constrained Optimal Power Flow: Risk-Aware Network Control under Uncertainty  

E-Print Network [OSTI]

When uncontrollable resources fluctuate, Optimum Power Flow (OPF), routinely used by the electric power industry to re-dispatch hourly controllable generation (coal, gas and hydro plants) over control areas of transmission networks, can result in grid instability, and, potentially, cascading outages. This risk arises because OPF dispatch is computed without awareness of major uncertainty, in particular fluctuations in renewable output. As a result, grid operation under OPF with renewable variability can lead to frequent conditions where power line flow ratings are significantly exceeded. Such a condition, which is borne by simulations of real grids, would likely resulting in automatic line tripping to protect lines from thermal stress, a risky and undesirable outcome which compromises stability. Smart grid goals include a commitment to large penetration of highly fluctuating renewables, thus calling to reconsider current practices, in particular the use of standard OPF. Our Chance Constrained (CC) OPF correct...

Bienstock, Daniel; Harnett, Sean

2012-01-01T23:59:59.000Z

288

A maximum power tracking algorithm based on photovoltaic current control for matching loads to a photovoltaic generator  

Science Journals Connector (OSTI)

In this paper, a novel maximum power point tracking (MPPT) approach is studied. It is based on the photovoltaic (PV) current control. The last one...

Ben Hamed Mouna; Sbita Lassad

2012-10-01T23:59:59.000Z

289

Multidisciplinary Modeling, Control, and Optimization of a Solid Oxide Fuel Cell/Gas Turbine Hybrid Power System.  

E-Print Network [OSTI]

??This thesis describes a systematical study, including multidisciplinary modeling, simulation, control, and optimization, of a fuel cell - gas turbine hybrid power system that aims (more)

Abbassi Baharanchi, Atid

2009-01-01T23:59:59.000Z

290

Control and simulation of a flywheel energy storage for a wind diesel power system  

Science Journals Connector (OSTI)

Abstract Wind diesel power systems (WDPSs) are isolated microgrids which combine wind diesel generators with wind turbine generators. If the WDPS includes a short-term energy storage system (ESS) both the logistic and the dynamic operation are improved. Flywheel based energy storage systems (FESSs) have characteristics that make them very appropriate to be used as short-term ESS in WDPS, so that a FESS, is added to the WDPS. The FESS main components: electrical machine, flywheel, grid converter and electrical machine converter are described. As the main aim of the FESS in the present article is power quality improvement, a robust low cost low-speed FESS (LS-FESS) is selected. The LS-FESS which includes an asynchronous machine (ASM) and a steel flywheel is sized for a particular WDPS. The FESS power converters and ASM can be controlled as if they were a servo but, in order to attain more robustness, it is better to control the ASM converter to maintain a constant DC-voltage in the DC-link and to control the grid converter to exchange the necessary power references with the isolated grid. Finally, in order to verify the proposed low speed FESS, it is simulated along with the WDPS. Simulation results with graphs for the isolated power system frequency and voltage, active powers generated/consumed by the WDPS elements, the FESS-ASM direct and quadrature currents and FESS-flywheel speed are presented for load and wind speed steps. The simulations show a power quality improvement of the isolated microgrid due to the use of the FESS.

R. Sebastin; R. Pea-Alzola

2015-01-01T23:59:59.000Z

291

Voltage/Pitch Control for Maximization and Regulation of Active/Reactive Powers in Wind Turbines with Uncertainties  

E-Print Network [OSTI]

This paper addresses the problem of controlling a variable-speed wind turbine with a Doubly Fed Induction Generator (DFIG), modeled as an electromechanically-coupled nonlinear system with rotor voltages and blade pitch angle as its inputs, active and reactive powers as its outputs, and most of the aerodynamic and mechanical parameters as its uncertainties. Using a blend of linear and nonlinear control strategies (including feedback linearization, pole placement, uncertainty estimation, and gradient-based potential function minimization) as well as time-scale separation in the dynamics, we develop a controller that is capable of maximizing the active power in the Maximum Power Tracking (MPT) mode, regulating the active power in the Power Regulation (PR) mode, seamlessly switching between the two modes, and simultaneously adjusting the reactive power to achieve a desired power factor. The controller consists of four cascaded components, uses realistic feedback signals, and operates without knowledge of the C_p-...

Guo, Yi; Jiang, John N; Tang, Choon Yik; Ramakumar, Rama G

2010-01-01T23:59:59.000Z

292

An expert system for voltage control in a power system network  

SciTech Connect (OSTI)

This paper presents a prototype of an expert system for alleviation of voltage violations in the day-to-day operation of large power networks. Voltage control for varying load and generation conditions can be achieved by co-ordinated control of switchable shunt VAR compensating (SVC) devices and On load transformer taps (OLTC), while generator excitations are used in dynamic control of voltage profile. This paper deals with the development of an expert system for voltage corrections for base case and contingency conditions using switchable shunt reactive compensation and transformer tap settings. The performance of the expert system is compared with the conventional optimization technique of voltage control and concurrent results have been obtained. The proposed expert system has been tested with simulated conditions of a few practical power systems. Results obtained for a 24 bus EHV Indian power network have been included for illustration purpose. The expert system is found to be suitable for on-line application in Energy Control Center as the solution is obtained very fast.

Bansilal; Thukaram, D.; Parthasarathy, K. [Indian Inst. of Science, Bangalore (India). Dept. of Electrical Engineering

1995-12-31T23:59:59.000Z

293

Design of a Receding Horizon Control System for Nuclear Reactor Power Distribution  

SciTech Connect (OSTI)

A receding horizon control method is applied to the axial power distribution control in a pressurized water reactor. The basic concept of receding horizon control is to solve on-line, at each sampling instant, an optimization problem for a finite future and to implement the first optimal control input as the current control input. Thus, it is a suitable control strategy for time-varying systems. The reactor model used for computer simulations is a two-point xenon oscillation model based on the nonlinear xenon and iodine balance equations and a one-group, one-dimensional, neutron diffusion equation with nonlinear power reactivity feedback that adequately describes axial oscillations and treats the nonlinearities explicitly. The reactor core is axially divided into two regions, and each region has one input and one output and is coupled with the other region. Through numerical simulations, it is shown that the proposed control algorithm exhibits very fast tracking responses due to the step and ramp changes of axial target shape and also works well in a time-varying parameter condition.

Na, Man Gyun [Chosun University (Korea, Republic of)

2001-07-15T23:59:59.000Z

294

Fuzzy logic controller based power management for a standalone solar/wind/fuel cell fed hybrid system  

Science Journals Connector (OSTI)

This paper proposes a new power conditioner topology with an intelligent power management controller that integrates multiple renewable energy sources such as solar energy wind energy and fuel cell energy with battery backup to make the best use of their operating characteristics and obtain better reliability than that could be obtained by single renewable energy based power supply. The proposed multiple-input converter uses neural network and fuzzy logic controller for maintaining a constant voltage at point of common coupling and efficient power flow control respectively. The power conditioner uses very limited number of switches and promises significant savings in component count and reduced losses. Also fuzzy logic controller based online estimation of state of charge and battery charging is also designed for the battery bank which is suitably connected by the controller to sink or source the input power based on the load requirement. The simulation results of the proposed system prove good in the stability aspect as well.

S. Saravanan; S. Thangavel

2013-01-01T23:59:59.000Z

295

Flow Noise Prediction and Control in Steam Piping Systems for Nuclear Power Plants  

Science Journals Connector (OSTI)

The flow noise of steam in pipe lines particularly in power plants is a major noise source and contributor to OSHA noise problems. The ability to predict flow noise levels is vital to efficient and economical noise control. Octave?band measurements of flow noise in the main steam piping system of a nuclear power plant were made. To determine the effect of velocity measurements were conducted for a wide range of velocities during plant start?up. Results in the form of plots of measured flow noise as a function of velocity were compared with limited data that have been recently published. An empirical formula for prediction of flow noise and corresponding design techniques for control of noise by proper pipe sizing have been developed. Alternate methods of noise control are reviewed.

F. H. Brittain; S. W. Giampapa

1973-01-01T23:59:59.000Z

296

A binary ACO for controlling all-electric power take off system in wave energy converters  

Science Journals Connector (OSTI)

This paper describes a metaheuristic algorithm for controlling all-electric power take off (PTO) system of wave energy converters. It provides optimal parameter values to the controller following the instantaneously changing sea state. The output of the algorithm is used to tune the electrical control systems in the PTO system in order to provide sufficient time for the point absorber to achieve desired heaving resonance compare with the ocean wave. This maximises the power extraction capability of WECs. The method consists of a binary ant colony optimisation algorithm capable of performing optimisation in continuous space. A binary encoding method is introduced to enhance its search exploration feature, hence allowing it to find optimal solution in short time.

Phen Chiak See; Vin Cent Tai; Marta Molinas

2013-01-01T23:59:59.000Z

297

A Receding Horizon Controller with a Parameter Estimator for Nuclear Reactor Power Distribution  

SciTech Connect (OSTI)

A receding horizon control method is used to solve on-line, at each time step, an optimization problem for a finite future interval and to implement the first optimal control input as the current control input. The receding horizon control method is combined with a parameter estimator to overcome the problems of the linear modeling and time-varying characteristics of a process. It is a suitable control strategy for time-varying systems, in particular, because the parameter estimator identifies a controller design model recursively at each time step, and also the receding horizon controller recalculates an optimal input at each time step by using newly measured signals. The proposed controller is applied to the axial power distribution control in a pressurized water reactor. The reactor dynamics model used for computer simulations is a two-point xenon oscillation model in which the reactor core is axially divided into two regions (upper and lower halves) and each region is assumed to have a single input and a single output and to be coupled with the other region. It is shown from numerical simulations that the proposed controller exhibits very fast tracking responses due to the step and ramp changes of axial target shape and also works well in a time-varying parameter condition.

Na, Man Gyun; Jung, Dong Won; Lee, Sun Mi [Paul Scherrer Institute (Switzerland)

2004-09-15T23:59:59.000Z

298

Nonlinear power flow feedback control for improved stability and performance of airfoil sections  

DOE Patents [OSTI]

A computer-implemented method of determining the pitch stability of an airfoil system, comprising using a computer to numerically integrate a differential equation of motion that includes terms describing PID controller action. In one model, the differential equation characterizes the time-dependent response of the airfoil's pitch angle, .alpha.. The computer model calculates limit-cycles of the model, which represent the stability boundaries of the airfoil system. Once the stability boundary is known, feedback control can be implemented, by using, for example, a PID controller to control a feedback actuator. The method allows the PID controller gain constants, K.sub.I, K.sub.p, and K.sub.d, to be optimized. This permits operation closer to the stability boundaries, while preventing the physical apparatus from unintentionally crossing the stability boundaries. Operating closer to the stability boundaries permits greater power efficiencies to be extracted from the airfoil system.

Wilson, David G.; Robinett, III, Rush D.

2013-09-03T23:59:59.000Z

299

Modeling of integrated environmental control systems for coal-fired power plants  

SciTech Connect (OSTI)

The Integrated Environmental Control Model (IECM) was designed to permit the systematic evaluation of environmental control options for pulverized coal-fired (PC) power plants. Of special interest was the ability to compare the performance and cost of advanced pollution control systems to conventional'' technologies for the control of particulate, SO{sub 2} and NO{sub x}. Of importance also was the ability to consider pre-combustion, combustion and post-combustion control methods employed alone or in combination to meet tough air pollution emission standards. Finally, the ability to conduct probabilistic analyses is a unique capability of the IECM. Key results are characterized as distribution functions rather than as single deterministic values. (VC)

Rubin, E.S.; Salmento, J.S.; Frey, H.C.; Abu-Baker, A.; Berkenpas, M.

1991-05-01T23:59:59.000Z

300

Modeling of integrated environmental control systems for coal-fired power plants. Final report  

SciTech Connect (OSTI)

The Integrated Environmental Control Model (IECM) was designed to permit the systematic evaluation of environmental control options for pulverized coal-fired (PC) power plants. Of special interest was the ability to compare the performance and cost of advanced pollution control systems to ``conventional`` technologies for the control of particulate, SO{sub 2} and NO{sub x}. Of importance also was the ability to consider pre-combustion, combustion and post-combustion control methods employed alone or in combination to meet tough air pollution emission standards. Finally, the ability to conduct probabilistic analyses is a unique capability of the IECM. Key results are characterized as distribution functions rather than as single deterministic values. (VC)

Rubin, E.S.; Salmento, J.S.; Frey, H.C.; Abu-Baker, A.; Berkenpas, M.

1991-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Performance Analysis of Fully Joint Diversity Combining, Adaptive Modulation, and Power Control Schemes  

E-Print Network [OSTI]

), Helsinki, Finland, June 2001, pp. 570?574. [13] N. Belhaj, N. Hamdi, M.-S. Alouini, and A. Bouallegue, ?Low-power minimum estimation and combining with adaptive modulation,? in Proc. IEEE Int. Symp. on Signal Processing and Its Applications (ISSPA?05..., ?Diversity combining with up-link power control,? in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Helsinki, Finland, September 2006, pp. 1?5. [17] A. Gjendemsj?, H. C. Yang, G. E. ?ien, and M.-S. Alouini, ?Minimum...

Bouida, Zied

2010-01-14T23:59:59.000Z

302

Current-based direct power control of a DFIG under unbalanced grid voltage  

Science Journals Connector (OSTI)

Abstract A novel current-based direct power control (CB-DPC) strategy for a grid-connected doubly-fed induction generator (DFIG) is proposed. The reported control scheme is applicable to DFIG-based variable-speed wind turbines that operate under unbalanced network voltages. The required DFIG rotor voltage for precise regulation of the stator active and reactive output powers and accurate elimination of their inherent pulsations are directly obtained using a nonlinear integral sliding-mode control (ISMC) scheme. Compared with other control methods, the proposed strategy is simpler since it is not based on the symmetrical components theory, does not need multiple synchronous coordinate transformations, and only requires DFIG voltage and current values as its inputs. Constant switching frequency of the rotor-side converter (RSC) is achieved by means of space vector pulse-width modulation (SVPWM) technique. Uncertainties in the parameters of the generator are included in the design. A compensation strategy is also proposed for tracking error mitigation of the powers that occur due to elimination of the chattering phenomena in the ISMC scheme. Simulation results on a 2MW DFIG under different operating conditions are presented to validate the effectiveness and robustness of the proposed method.

Mohammad Farshadnia; Seyed Abbas Taher

2014-01-01T23:59:59.000Z

303

Interactive multiobjective daily volt/var control of distribution networks considering wind power and fuel-cell power plants  

Science Journals Connector (OSTI)

This paper deals with a multiobjective daily volt/var control (MDVVC) for radial distribution feeders integrated renewable energy sources (RES) by means of the tap position of the under load tap changer (ULTC) transformers shunt capacitors and active and reactive power of RES. The multiple objective functions to be minimized are the electrical energy losses the voltage deviations and the total emissions of RES and substations. Discrete behavior of equipments in the distribution systems and nonlinear power flow equations change the VVC problem into a mixed integer non-linear programming (MINLP). Hence a new optimization method based upon the shuffled frog leaping algorithm (SFLA) is presented to solve the optimization problem. The SFLA is modified for resolving the disadvantages of the original algorithm. Besides of accurately passing local optima the MSFLA takes less time to achieve the optimal response. Furthermore the tribe-MSFLA is proposed through using the concept of the tribe. Dealing with the multiobjective optimization problem an interactive fuzzy satisfying method is used while the objective functions are formulated by a fuzzy set theory. An 85-bus radial distribution system is used to test and assess the performance of the proposed algorithm.

Taher Niknam; Mohsen Zare; Jamshid Aghaei; Rasoul Azizipanah-Abarghooee

2012-01-01T23:59:59.000Z

304

North American Power Symposium NAPS, Cleveland, Ohio, October 1998, pp. 294 299. Fundamental Frequency Model of Uni ed Power Flow Controller  

E-Print Network [OSTI]

. The two main objectives of FACTS are to increase the transmission ca- pacity of ac lines and control power ow over designated transmission routes. The improvements in the eld of power electronics have had Capacitor TCSC, as it permits a change in the impedance of the transmission line through a voltage source

Cañizares, Claudio A.

305

Extended Constant Power Speed Range of the Brushless DC Motor Through Dual Mode Inverter Control  

SciTech Connect (OSTI)

The trapezoidal back electromotive force (emf) brushless direct current (dc) motor (BDCM) with surface-mounted magnets has high-power density and efficiency especially when rare-earth magnet materials are used. Traction applications, such as electric vehicles, could benefit significantly from the use of such motors. Unfortunately, a practical means for driving the motor over a constant power speed ratio (CPSR) of 5:1 or more has not yet been developed. A key feature of these motors is that they have low internal inductance. The phase advance method is effective in controlling the motor power over such a speed range, but the current at high speed may be several times greater than that required at the base speed. The increase in current during high-speed operation is due to the low motor inductance and the action of the bypass diodes of the inverter. The use of such a control would require increased current rating of the inverter semiconductors and additional cooling for the inverter, where the conduction losses increase proportionally with current, and especially for the motor, where the losses increase with the square of the current. The high current problems of phase advance can be mitigated by adding series inductance; however, this reduces power density, requires significant increase in supply voltage, and leaves the CPSR performance of the system highly sensitive to variations in the available voltage. A new inverter topology and control scheme has been developed that can drive low-inductance BDCMs over the CPSR that would be required in electric vehicle applications. This new controller is called the dual-mode inverter control (DMIC). It is shown that the BDCM has an infinite CPSR when it is driven by the DMIC.

Lawler, J.S.

2000-06-23T23:59:59.000Z

306

Advance Three Phase Power Factor Correction Schemes for Utility Interface of Power Electronic Systems  

E-Print Network [OSTI]

systems, battery chargers and data centers etc. Also, high voltage DC (HVDC) systems employ rectifiers to convert ac input to DC output. HVDC is one example of the application of AC/DC conversion, in power system also, grid tie of two different power...

Albader, Mesaad

2014-07-30T23:59:59.000Z

307

1068 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 4, APRIL 2010 Modeling and Control Design for a Very  

E-Print Network [OSTI]

- generative decentralized sources and the continuous replacement of overhead power lines by subterraneous decentralized sources and the continuous re- placement of overhead power lines by subterraneous distribu- tion1068 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 4, APRIL 2010 Modeling and Control Design

Paderborn, Universität

308

Direct power control of shunt active filter using high selectivity filter (HSF) under distorted or unbalanced conditions  

E-Print Network [OSTI]

.A. Djaffar) Abstract This paper describes the design of a new configuration of direct power control (DPC inverter voltage vector in order to minimize instantaneous active and reactive power errors using two powers by selecting the optimal switching states of the inverter. Simulation results have proved

Paris-Sud XI, Université de

309

248 IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 17, NO. 1, JANUARY 2002 Modeling, Analysis, and Control of a Current Source  

E-Print Network [OSTI]

--This paper presents a new approach for the dy- namic control of a current source inverter (CSI)-based STATic-commutated inverters to achieve advanced reactive power control have been confirmed by many researchers [1248 IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 17, NO. 1, JANUARY 2002 Modeling, Analysis

Lehn, Peter W.

310

Cost effective designs for integrating new electronic turbine control systems into existing steam power plants  

SciTech Connect (OSTI)

Different cost-effective approaches have been developed for integrating new digital turbine control systems into existing power plants. The devices under consideration range from self contained actuators which replace the existing hydraulic and mechanical servomotor components, linear proportional actuators, which mechanically drive the original servomotor pilot relays, to electro-hydraulic converters which provide a control pressure to the existing hydraulic servomotor pilot relays. These devices significantly reduce the implementation cost, while still providing most of the benefits that can be gained through greater utilization of the new electronic control capabilities. These three design approaches are analyzed for control performance, failure modes, long-term maintenance issues, and applicability to specific turbine configurations.

Nguyen, T.V. [Westinghouse Electric Corp., Orlando, FL (United States)

1996-10-01T23:59:59.000Z

311

Voltage and Frequency Control in Offshore Wind Turbines Connected to Isolated Oil Platform Power Systems  

Science Journals Connector (OSTI)

Offshore wind turbines have potential to supply offshore oil and gas platforms in the North Sea with electric energy. For remote located facilities it is attractive to pursue a solution where the wind turbines and oil platform operate in an isolated system. To study the operational properties of a system with these characteristics is necessary to identify possible advantages and disadvantages. This paper demonstrates how added voltage and frequency control in wind turbines equipped with full power electronic converters can improve the voltage and frequency stability in offshore oil and gas installations. The work is based on an electrical simulation model built in the PSCAD software. In the proposed transient simulation scenarios, the voltage dip is reduced from 16% to 6%, while the frequency overshoot is reduced from 97% to 25%. These are significant improvements that should be taken into consideration when offshore wind power is evaluated as power supply to oil installations.

Atle Rygg rdal; Tore Undeland; Kamran Sharifabadi

2012-01-01T23:59:59.000Z

312

Loss of integrated control system power and overcooling transient at Rancho Seco on December 26, 1985  

SciTech Connect (OSTI)

On December 26, 1985, Rancho Seco Nuclear Generating Station, located in Clay, California, about 25 miles southeast of Sacramento, experienced a loss of dc power within the integrated control system (ICS) while the plant was operating at 76% power. The plant is owned by the Sacramento Municipal Utility District (SMUD). Following the loss of ICS dc power, the reactor tripped on high reactor coolant system (RCS) pressure followed by a rapid overcooling transient and automatic initiation of the safety features actuation system on low RCS pressure. The overcooling transient continued until ICS dc power was restored 26 minutes after its loss. The fundamental causes for this transient were design weaknesses and vulnerabilities in the ICS and in the equipment controlled by that system. These weaknesses and vulnerabilities were not adequately compensated by other design features, plant procedures or operator training. These weaknesses and vulnerabilities were largely known to SMUD and the NRC staff by virtue of a number of precursor events and through related analyses and studies. Yet, adequate plant modifications were not made so that this event would be improbable, or so that its course or consequences would be altered significantly. The information was available and known which could have prevented this overcooling transient; but in the absence of adequate plant modifications, the incident should have been expected. The report includes findings and conclusions of the NRC Incident Investigation Team sent to Rancho Seco by the NRC Executive Director for Operations in conformance with NRC's recently established Incident Investigation Program. 33 figs.

Not Available

1986-02-01T23:59:59.000Z

313

Controls on morphological variability and role of stream power distribution pattern, Yamuna River, western India  

Science Journals Connector (OSTI)

Abstract Understanding the controls on the morphological variability of river systems constitutes one of the fundamental questions in geomorphic investigation. Channel morphology is an important indicator of river processes and is of significance for mapping the hydrology-ecologic connectivity in a river system and for predicting the future trajectory of river health in response to external forcings. This paper documents the spatial morphological variability and its natural and anthropogenic controls for the Yamuna River, a major tributary of the Ganga River, India. The Yamuna River runs through a major urban centre i.e. Delhi National Capital Region. The Yamuna River was divided into eight geomorphically distinct reaches on the basis of the assemblages of geomorphic units and the association of landscape, valley and floodplain settings. The morphological variability was analysed through stream power distribution and sediment load data at various stations. Stream power distribution of the Yamuna River basin is characterised by a non-linear pattern that was used to distinguish (a) high energy natural upstream reaches, (b) anthropogenically altered, low energy middle stream reaches, and (c) rejuvenated downstream reaches again with higher stream power. The relationship between stream power and channel morphology in these reaches was integrated with sediment load data to define the maximum flow efficiency (MFE) as the threshold for geomorphic transition. This analysis supports the continuity of river processes and the significance of a holistic, basin-scale approach rather than isolated local scale analysis in river studies.

Nupur Bawa; Vikrant Jain; Shashank Shekhar; Niraj Kumar; Vikas Jyani

2014-01-01T23:59:59.000Z

314

140 IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 9, NO. 1, JANUARY 2001 Fuzzy Damage-Mitigating Control of a Fossil Power  

E-Print Network [OSTI]

-data controller tracks a reference trajectory vector while the upper tier contains a fuzzy-logic-based damage140 IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 9, NO. 1, JANUARY 2001 Fuzzy Damage of real-time fuzzy damage-mitigating control in fossil power plants, and the results show that substantial

Ray, Asok

315

1462 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 26, NO. 3, AUGUST 2011 A Self-Organizing Strategy for Power Flow Control  

E-Print Network [OSTI]

con- trol algorithm that will regulate the power output of multiple pho- tovoltaic generators (PVs) in a distribution network. To this end, the cooperative control methodology from network control theory is used-00267-2010. H. Xin is with the Department of Electrical Engineering, Zhejiang University, Hangzhou

Qu, Zhihua

316

Applying Human Factors Evaluation and Design Guidance to a Nuclear Power Plant Digital Control System  

SciTech Connect (OSTI)

The United States (U.S.) nuclear industry, like similar process control industries, has moved toward upgrading its control rooms. The upgraded control rooms typically feature digital control system (DCS) displays embedded in the panels. These displays gather information from the system and represent that information on a single display surface. In this manner, the DCS combines many previously separate analog indicators and controls into a single digital display, whereby the operators can toggle between multiple windows to monitor and control different aspects of the plant. The design of the DCS depends on the function of the system it monitors, but revolves around presenting the information most germane to an operator at any point in time. DCSs require a carefully designed human system interface. This report centers on redesigning existing DCS displays for an example chemical volume control system (CVCS) at a U.S. nuclear power plant. The crucial nature of the CVCS, which controls coolant levels and boration in the primary system, requires a thorough human factors evaluation of its supporting DCS. The initial digital controls being developed for the DCSs tend to directly mimic the former analog controls. There are, however, unique operator interactions with a digital vs. analog interface, and the differences have not always been carefully factored in the translation of an analog interface to a replacement DCS. To ensure safety, efficiency, and usability of the emerging DCSs, a human factors usability evaluation was conducted on a CVCS DCS currently being used and refined at an existing U.S. nuclear power plant. Subject matter experts from process control engineering, software development, and human factors evaluated the DCS displays to document potential usability issues and propose design recommendations. The evaluation yielded 167 potential usability issues with the DCS. These issues should not be considered operator performance problems but rather opportunities identified by experts to improve upon the design of the DCS. A set of nine design recommendations was developed to address these potential issues. The design principles addressed the following areas: (1) color, (2) pop-up window structure, (3) navigation, (4) alarms, (5) process control diagram, (6) gestalt grouping, (7) typography, (8) terminology, and (9) data entry. Visuals illustrating the improved DCS displays accompany the design recommendations. These nine design principles serve as the starting point to a planned general DCS style guide that can be used across the U.S. nuclear industry to aid in the future design of effective DCS interfaces.

Thomas Ulrich; Ronald Boring; William Phoenix; Emily Dehority; Tim Whiting; Jonathan Morrell; Rhett Backstrom

2012-08-01T23:59:59.000Z

317

Modeling of integrated environmental control systems for coal-fired power plants  

SciTech Connect (OSTI)

The general goal of this research project is to enhance, and transfer to DOE, a new computer simulation model for analyzing the performance and cost of environmental control systems for coal-fired power plants. Systems utilizing pre-combustion, combustion, or post-combustion control methods, individually or in combination, may be considered. A unique capability of this model is the probabilistic representation of uncertainty in model input parameters. This stochastic simulation capability allows the performance and cost of environmental control systems to be quantified probabilistically, accounting for the interactions among all uncertain process and economic parameters. This method facilitates more rigorous comparisons between conventional and advanced clean coal technologies promising improved cost and/or effectiveness for SO{sub 2} and NO{sub x} removal. Detailed modeling of several pre-combustion and post-combustion processes of interest to DOE/PETC have been selected for analysis as part of this project.

Rubin, E.S.

1989-10-01T23:59:59.000Z

318

Constrained control framework for a stand-alone hybrid (Stirling engine)/supercapacitor power generation system  

Science Journals Connector (OSTI)

Abstract In this paper, a complete control architecture is proposed for the voltage conditioning stage of a hybrid power generation system composed of a Stirling engine coupled with a supercapacitor. Such a solar energy-based generation system aims at providing electricity to off-grid regions. The novelty of the proposed architecture is that it completely handles constraints on all the state variables of the electric stage while providing near to optimal performances in terms of settling time. The derivation of the control law enables a deep understanding of the main issues involved in the success of the closed-loop control. Moreover, the resulting feedback laws are real-time compatible and are given in a complete explicit form.

M. Alamir; M.A. Rahmani; D. Gualino

2014-01-01T23:59:59.000Z

319

Method of installing a control room console in a nuclear power plant  

DOE Patents [OSTI]

An advanced control room complex for a nuclear power plant, including a discrete indicator and alarm system (72) which is nuclear qualified for rapid response to changes in plant parameters and a component control system (64) which together provide a discrete monitoring and control capability at a panel (14-22, 26, 28) in the control room (10). A separate data processing system (70), which need not be nuclear qualified, provides integrated and overview information to the control room and to each panel, through CRTs (84) and a large, overhead integrated process status overview board (24). The discrete indicator and alarm system (72) and the data processing system (70) receive inputs from common plant sensors and validate the sensor outputs to arrive at a representative value of the parameter for use by the operator during both normal and accident conditions, thereby avoiding the need for him to assimilate data from each sensor individually. The integrated process status board (24) is at the apex of an information hierarchy that extends through four levels and provides access at each panel to the full display hierarchy. The control room panels are preferably of a modular construction, permitting the definition of inputs and outputs, the man machine interface, and the plant specific algorithms, to proceed in parallel with the fabrication of the panels, the installation of the equipment and the generic testing thereof.

Scarola, Kenneth (Windsor, CT); Jamison, David S. (Windsor, CT); Manazir, Richard M. (North Canton, CT); Rescorl, Robert L. (Vernon, CT); Harmon, Daryl L. (Enfield, CT)

1994-01-01T23:59:59.000Z

320

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 24, NO. 11, NOVEMBER 2009 2625 Hybrid Digital Adaptive Control for Fast Transient  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 24, NO. 11, NOVEMBER 2009 2625 Hybrid Digital Adaptive, IEEE, and Dragan Maksimovi´c, Senior Member, IEEE Abstract--This paper presents a hybrid digital advanced control concepts, such as hybrid control [1]. Hybrid controllers, which include switching among

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Distributed control of reactive power flow in a radial distribution circuit with high photovoltaic penetration  

SciTech Connect (OSTI)

We show how distributed control of reactive power can serve to regulate voltage and minimize resistive losses in a distribution circuit that includes a significant level of photovoltaic (PV) generation. To demonstrate the technique, we consider a radial distribution circuit with a single branch consisting of sequentially-arranged residential-scale loads that consume both real and reactive power. In parallel, some loads also have PV generation capability. We postulate that the inverters associated with each PV system are also capable of limited reactive power generation or consumption, and we seek to find the optimal dispatch of each inverter's reactive power to both maintain the voltage within an acceptable range and minimize the resistive losses over the entire circuit. We assume the complex impedance of the distribution circuit links and the instantaneous load and PV generation at each load are known. We compare the results of the optimal dispatch with a suboptimal local scheme that does not require any communication. On our model distribution circuit, we illustrate the feasibility of high levels of PV penetration and a significant (20% or higher) reduction in losses.

Chertkov, Michael [Los Alamos National Laboratory; Turitsyn, Konstantin [Los Alamos National Laboratory; Backhaus, Scott [Los Alamos National Laboratory; Sule, Petr [NEW MEXICO CONSORTIUM

2009-01-01T23:59:59.000Z

322

Semiconductor systems utilizing materials that form rectifying junctions in both N and P-type doping regions, whether metallurgically or field induced, and methods of use  

DOE Patents [OSTI]

Disclosed are semiconductor systems, such as integrated circuits utilizing Schotky barrier and/or diffused junction technology, which semiconductor systems incorporate material(s) that form rectifying junctions in both metallurgically and/or field induced N and P-type doping regions, and methods of their use. Disclosed are Schottky barrier based inverting and non-inverting gate voltage channel induced semiconductor single devices with operating characteristics similar to multiple device CMOS systems and which can be operated as modulators, N and P-channel MOSFETS and CMOS formed therefrom, and (MOS) gate voltage controlled rectification direction and gate voltage controlled switching devices, and use of such material(s) to block parasitic current flow pathways. Simple demonstrative five mask fabrication procedures for inverting and non-inverting gate voltage channel induced semiconductor single devices with operating characteristics similar to multiple device CMOS systems are also presented.

Welch, James D. (10328 Pinehurst Ave., Omaha, NE 68124)

2000-01-01T23:59:59.000Z

323

A Multi-Pollutant Framework for Evaluating CO2 Control Options for Fossil Fuel Power Plants  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Multi-Pollutant Framework for Evaluating CO Multi-Pollutant Framework for Evaluating CO 2 Control Options for Fossil Fuel Power Plants Edward S. Rubin (rubin@cmu.edu; 412-268-5897) Anand B. Rao (abr@andrew.cmu.edu; 412-268-5605) Michael B. Berkenpas (mikeb@cmu.edu; 412-268-1088) Carnegie Mellon University EPP Department, Baker Hall 128A Pittsburgh, PA 15213 Abstract As part of DOE/NETL's Carbon Sequestration Program, we are developing an integrated, multi-pollutant modeling framework to evaluate the costs and performance of alternative carbon capture and sequestration technologies for fossil-fueled power plants. The model calculates emissions, costs, and efficiency on a systematic basis at the level of an individual plant or facility. Both new and existing facilities can be modeled, including coal-based or natural gas-based combustion or gasification systems using air or oxygen.

324

Evaluation of BWROG EPG level/power control strategy for Vermont Yankee  

SciTech Connect (OSTI)

The current Boiling Water Reactor Owner's Group (BWROG) emergency procedure guidelines (EPGs) direct reactor operators to manually lower the reactor pressure vessel (RPV) water level to the top of active fuel (TAF) during an anticipated transient without scram (ATWS) event. Lowering the water level reduces the core inlet flow, thereby reducing core power. However, reducing water level is contrary to current operator training, which requires that normal RPV water level be maintained to assure core cooling. In addition, the indicated water level near TAF using cold calibrated level instrumentation may not be reliable, which could potentially result in uncovering the core. This paper evaluates the EPGs' level/power control strategy for the Vermont Yankee plant and proposes alternative to the BWROG guidelines as applied to ATWS response.

Chandola, V.; Robichaud, J.D.

1987-01-01T23:59:59.000Z

325

ANN-based reactive power controller with real-time web monitoring  

Science Journals Connector (OSTI)

This study introduced a real-time reactive power controller based on artificial neural network with web-based monitoring. A feed-forward employing back-propagation was used as training technique. The inputs to the network were the active and reactive power of each load. The targets were to switch on/off the capacitor banks during normal and abnormal conditions. The network was trained using developed MATLAB program and the weights resulted to minimum mean-square-error were fed to the microcontroller unit. The method was then tested in a three-bus radial distribution system model and implemented using Zilog microcontroller. The system actions were monitored using web-based monitoring application. The method was validated in actual operation of the system using the test data and results were satisfactorily obtained.

Carl John O. Salaan; Mark Joseph M. Victoria; Noel R. Estoperez

2013-01-01T23:59:59.000Z

326

Joint Routing, Scheduling And Power Control For Multihop Wireless Networks With Multiple Antennas  

E-Print Network [OSTI]

We consider the problem of Joint Routing, Scheduling and Power-control (JRSP) problem for multihop wireless networks (MHWN) with multiple antennas. We extend the problem and a (sub-optimal) heuristic solution method for JRSP in MHWN with single antennas. We present an iterative scheme to calculate link capacities(achievable rates) in the interference environment of the network using SINR model. We then present the algorithm for solving the JRSP problem. This completes a feasible system model for MHWN when nodes have multiple antennas. We show that the gain we achieve by using multiple antennas in the network is linear both in optimal performance as well as heuristic algorithmic performance.

Vangala, Harish; Sharma, Prof Vinod

2011-01-01T23:59:59.000Z

327

The design of a controllable energy recovery device for solar powered reverse osmosis desalination with experimental validation  

E-Print Network [OSTI]

The purpose of this thesis is to design and validate a controllable energy recovery device with application to photovoltaic powered reverse osmosis (PVRO). The energy consumption of a reverse osmosis plant depends significantly ...

Reed, Elizabeth Anne, S.M. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

328

Modeling and controller synthesis for the cascaded H-bridge multilevel active power filter with ADALINE-based identifiers  

Science Journals Connector (OSTI)

This paper presents the averaged state-space modeling and controller synthesis methodology for the cascaded H-bridge multilevel active power filters (CHB-APFs). ... compensation and dc-link stabilization among th...

Yang Han; Lin Xu; Muhammad Mansoor Khan; Chen Chen

2011-06-01T23:59:59.000Z

329

Examining System-Wide Impacts of Solar PV Control Systems with a Power Hardware-in-the-Loop Platform  

SciTech Connect (OSTI)

High penetration levels of distributed solar PV power generation can lead to adverse power quality impacts such as excessive voltage rise, voltage flicker, and reactive power values that result in unacceptable voltage levels. Advanced inverter control schemes have been proposed that have the potential to mitigate many power quality concerns. However, closed-loop control may lead to unintended behavior in deployed systems as complex interactions can occur between numerous operating devices. In order to enable the study of the performance of advanced control schemes in a detailed distribution system environment, a Hardware-in-the-Loop (HIL) platform has been developed. In the HIL system, GridLAB-D, a distribution system simulation tool, runs in real-time mode at the Pacific Northwest National Laboratory (PNNL) and supplies power system parameters at a point of common coupling to hardware located at the National Renewable Energy Laboratory (NREL). Hardware inverters interact with grid and PV simulators emulating an operational distribution system and power output from the inverters is measured and sent to PNNL to update the real-time distribution system simulation. The platform is described and initial test cases are presented. The platform is used to study the system-wide impacts and the interactions of controls applied to inverters that are integrated into a simulation of the IEEE 8500-node test feeder, with inverters in either constant power factor control or active volt/VAR control. We demonstrate that this HIL platform is well-suited to the study of advanced inverter controls and their impacts on the power quality of a distribution feeder. Additionally, the results from HIL are used to validate GridLAB-D simulations of advanced inverter controls. ?

Williams, Tess L.; Fuller, Jason C.; Schneider, Kevin P.; Palmintier, Bryan; Lundstrom, Blake; Chakraborty, Sudipta

2014-10-11T23:59:59.000Z

330

OSCAR API v2.1: Extensions for an Advanced Accelerator Control Scheme to a Low-Power  

E-Print Network [OSTI]

OSCAR API v2.1: Extensions for an Advanced Accelerator Control Scheme to a Low-Power Multicore API optimization and low-power optimization, has been developed. Furthermore, the OSCAR API has been also developed, AMD, Tilera, Fujitsu, Renesas Electronics, and so on. The OSCAR API v1.0 and v2.0 have been opened

Kasahara, Hironori

331

Dynamic Control of Electricity Cost with Power Demand Smoothing and Peak Shaving for Distributed Internet Data Centers  

E-Print Network [OSTI]

Dynamic Control of Electricity Cost with Power Demand Smoothing and Peak Shaving for Distributed a major part of their running costs. Modern electric power grid provides a feasible way to dynamically and efficiently manage the electricity cost of distributed IDCs based on the Locational Marginal Pricing (LMP

Rahman, A.K.M. Ashikur

332

1028 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 14, NO. 6, NOVEMBER 1999 Discrete Time Modeling and Control of  

E-Print Network [OSTI]

S 0885-8993(99)08907-3. and high-power inverter applications. Consequently, improved dynamics1028 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 14, NO. 6, NOVEMBER 1999 Discrete Time Modeling Abstract--A new voltage source converter control approach is presented, based on multivariable z

Lehn, Peter W.

333

Abstract--Digital control is a powerful modern design technique and important research topic in power electronics, and  

E-Print Network [OSTI]

in power electronics, and it is useful to have a simple but flexible platform for experimentation Electronics Center, ECE Dept. University of Colorado at

334

AC Resonant charger with charge rate unrelated to primary power frequency  

DOE Patents [OSTI]

An AC resonant charger for a capacitive load, such as a PFN, is provided with a variable repetition rate unrelated to the frequency of a multi-phase AC power source by using a control unit to select and couple the phase of the power source to the resonant charger in order to charge the capacitive load with a phase that is the next to begin a half cycle. For optimum range in repetition rate and increased charging voltage, the resonant charger includes a step-up transformer and full-wave rectifier. The next phase selected may then be of either polarity, but is always selected to be of a polarity opposite the polarity of the last phase selected so that the transformer core does not saturate. Thyristors are used to select and couple the correct phase just after its zero crossover in response to a sharp pulse generated by a zero-crossover detector. The thyristor that is turned on then automatically turns off after a full half cycle of its associated phase input. A full-wave rectifier couples the secondary winding of the transformer to the load so that the load capacitance is always charged with the same polarity.

Watson, Harold (Torrance, CA)

1982-01-01T23:59:59.000Z

335

Predictive current control of outer-rotor five-phase BLDC generators applicable for off-shore wind power plants  

Science Journals Connector (OSTI)

Abstract Model predictive control algorithms have recently gained more importance in the field of wind power generators. One of the important categories of model predictive control methods is improved deadbeat control in which the reverse model of generator is used to calculate the appropriate inputs for the next iteration of controlling process. In this paper, a new improved deadbeat algorithm is proposed to control the stator currents of an outer-rotor five-phase BLDC generator. Extended Kalman filter is used in the estimation step of proposed method, and generator equations are used to calculate the appropriate voltages for the next modulation period. Two aspects of proposed controlling method are evaluated including its sensitivity to generator parameter variations and its speed in following the reference values of required torque during transient states. Wind power generators are kept in mind, and proposed controlling method is both simulated and experimentally evaluated on an outer-rotor five-phase BLDC generator.

Jose Luis Romeral Martinez; Ramin Salehi Arashloo; Mehdi Salehifar; Juan Manuel Moreno

2014-01-01T23:59:59.000Z

336

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 12, NO. 1, JANUARY 1997 87 Fuzzy Logic Based Intelligent Control of a Variable  

E-Print Network [OSTI]

system. The generation system has fuzzy logic control with vector control in the inner loops. A fuzzyIEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 12, NO. 1, JANUARY 1997 87 Fuzzy Logic Based a variable speed wind genera- tion system where fuzzy logic principles are used for efficiency optimization

Simões, Marcelo Godoy

337

The Application of Planning to Power Substation Voltage Control Keith Bell, Andrew Coles, Maria Fox, Derek Long and Amanda Smith  

E-Print Network [OSTI]

The Application of Planning to Power Substation Voltage Control Keith Bell, Andrew Coles, Maria Fox substations is a complex control task involving the coordination of interactions between cus- tomer demand and substation components. In this paper we look at the efficient management of substations in a pre-fault state

Coles, Andrew

338

IEEE POWER ELECTRONICS LETTERS, VOL. 2, NO. 2, JUNE 2004 51 Digital Phase Control for Resonant Inverters  

E-Print Network [OSTI]

. In this letter, we present and verify a new concept for direct digital phase control of resonant invertersIEEE POWER ELECTRONICS LETTERS, VOL. 2, NO. 2, JUNE 2004 51 Digital Phase Control for Resonant Inverters Yan Yin, Student Member, IEEE, and Regan Zane, Member, IEEE Abstract--This letter presents

339

ASSESSMENT OF LOW COST NOVEL SORBENTS FOR COAL-FIRED POWER PLANT MERCURY CONTROL  

SciTech Connect (OSTI)

The injection of sorbents upstream of a particulate control device is one of the most promising methods for controlling mercury emissions from coal-fired utility boilers with electrostatic precipitators and fabric filters. Studies carried out at the bench-, pilot-, and full-scale have shown that a wide variety of factors may influence sorbent mercury removal effectiveness. These factors include mercury species, flue gas composition, process conditions, existing pollution control equipment design, and sorbent characteristics. The objective of the program is to obtain the necessary information to assess the viability of lower cost alternatives to commercially available activated carbon for mercury control in coal-fired utilities. Prior to injection testing, a number of sorbents were tested in a slipstream fixed-bed device both in the laboratory and at two field sites. Based upon the performance of the sorbents in a fixed-bed device and the estimated cost of mercury control using each sorbent, seventeen sorbents were chosen for screening in a slipstream injection system at a site burning a Western bituminous coal/petcoke blend, five were chosen for screening at a site burning a subbituminous Powder River Basin (PRB) coal, and nineteen sorbents were evaluated at a third site burning a PRB coal. Sorbents evaluated during the program were of various materials, including: activated carbons, treated carbons, other non-activated carbons, and non-carbon material. The economics and performance of the novel sorbents evaluated demonstrate that there are alternatives to the commercial standard. Smaller enterprises may have the opportunity to provide lower price mercury sorbents to power generation customers under the right set of circumstances.

Sharon Sjostrom

2004-03-01T23:59:59.000Z

340

Multicore Architecture for Control and Emulation of Power Electronics and Smart Grid Systems  

E-Print Network [OSTI]

of Technology Power Electronics Power electronics is broadly defined as a solid-state energy conversion of power electronic circuits are: electronic (solid-state) switches and energy storage elements on one side and battery. It enables power grid dynamic stabilization. An adequate design, testing, and validation of power

Sanders, Seth

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

System and method for controlling power consumption in a computer system based on user satisfaction  

DOE Patents [OSTI]

Systems and methods for controlling power consumption in a computer system. For each of a plurality of interactive applications, the method changes a frequency at which a processor of the computer system runs, receives an indication of user satisfaction, determines a relationship between the changed frequency and the user satisfaction of the interactive application, and stores the determined relationship information. The determined relationship can distinguish between different users and different interactive applications. A frequency may be selected from the discrete frequencies at which the processor of the computer system runs based on the determined relationship information for a particular user and a particular interactive application running on the processor of the computer system. The processor may be adapted to run at the selected frequency.

Yang, Lei; Dick, Robert P; Chen, Xi; Memik, Gokhan; Dinda, Peter A; Shy, Alex; Ozisikyilmaz, Berkin; Mallik, Arindam; Choudhary, Alok

2014-04-22T23:59:59.000Z

342

Electric Power Research Institute Environmental Control Technology Center Report to the Steering Committee  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute's (EPRI?s) Environmental Control Technology Center (ECTC). Testing for the month involved the Dry Sorbent Injection (DSI) test block with the Carbon Injection System. Also, several installation activities were initiated this month for the testing of a new EPRI/ADA Technologies sorbent sampling system in December. The 1.0 MW Cold-Side Selective Catalytic Reduction (SCR) unit, the 0.4 MW Mini Pilot Wet Scrubber, and the 4.0 MW Pilot Wet Scrubber remained idle this month in a cold-standby mode and were inspected regularly. These units remain available for testing as future work is identified.

None

1997-11-01T23:59:59.000Z

343

Aging Management Guideline for commercial nuclear power plants: Motor control centers; Final report  

SciTech Connect (OSTI)

This Aging Management Guideline (AMG) provides recommended methods for effective detection and mitigation of age-related degradation mechanisms in Boiling Water Reactor (BWR) and Pressurized Water Reactor (PWR) commercial nuclear power plant motor control centers important to license renewal. The intent of this AMG is to assist plant maintenance and operations personnel in maximizing the safe, useful life of these components. It also supports the documentation of effective aging management programs required under the License Renewal Rule 10 CFR Part 54. This AMG is presented in a manner that allows personnel responsible for performance analysis and maintenance to compare their plant-specific aging mechanisms (expected or already experienced) and aging management program activities to the more generic results and recommendations presented herein.

Toman, G.; Gazdzinski, R.; O`Hearn, E. [Ogden Environmental and Energy Services Co., Inc., Blue Bell, PA (United States)

1994-02-01T23:59:59.000Z

344

Hybrid Control Network Intrusion Detection Systems for Automated Power Distribution Systems  

E-Print Network [OSTI]

security for the electric power grid, Proceedings of thecontrol commands in power grids, in Proc. of the First ACMreveal the state of the power grid, as exemplified by State

Parvania, Masood; Koutsandria, Georgia; Muthukumar, Vishak; Peisert, Sean; McParland, Chuck; Scaglione, Anna

2014-01-01T23:59:59.000Z

345

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network [OSTI]

be realized by capturing wind power at altitudes over the2011. [2] , High altitude wind power systems: A survey onOckels, Optimal cross-wind towing and power generation with

Ghaffari, Azad

2013-01-01T23:59:59.000Z

346

Electric Power Research Institute Environmental Control Technology Center: Report to the Steering Committee, June 1996  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute`s (EPRI`s) Environmental Control Technology Center (ECTC). Testing for the Hazardous Air Pollutant (HAP) test block was conducted using the 4.0 MW Spray Dryer Absorber System (SDA) and Pulse Jet Fabric Filter (PJFF) - Carbon Injection System. Investigations also continued across the B&W/CHX Heat Exchanger unit, while the 1.0 MW Selective Catalytic Reduction (SCR) unit remained idle this month in a cold-standby mode as monthly inspections were conducted. Pilot Testing Highlights Testing efforts in June were focused on the HAP test block and the Trace Elements Removal (TER) test block. Both programs were conducted on the 4.0 MW wet FGD pilot unit and PJFF unit. The HAP test block was temporarily concluded in June to further review the test data. This program began in March as part of the DOE Advanced Power Systems Program; the mission of this program is to accelerate the commercialization of affordable, high-efficiency, low-emission, coal-fueled electric generating technologies. The 1996 HAP test block focuses on three research areas, including: Catalytic oxidation of vapor-phase elemental mercury; Enhanced particulate-phase HAPs removal by electrostatic charging of liquid droplets; and Enhanced mercury removal by addition of additives to FGD process liquor. The TER test block is part of EPRI`s overall program to develop control technology options for reduction of trace element emissions. This experimental program investigates mercury removal and mercury speciation under different operating conditions.

NONE

1996-06-01T23:59:59.000Z

347

Bulk Power System Dynamics and Control V, August 26-31, 2001, Onomichi, Japan Inverse Problems in Power Systems  

E-Print Network [OSTI]

within power electronic circuits. On the other hand, event-driven discrete behaviour is nor- mally or a FACTS device encounters its maxi- mum/minimum firing angle. To illustrate continuous the fault and decide on the appropriate response. Trip signals are sent to circuit breakers, which

Hiskens, Ian A.

348

Control of plasma uniformity in a capacitive discharge using two very high frequency power sources  

SciTech Connect (OSTI)

Very high frequency (VHF) capacitively coupled plasma (CCP) discharges are being employed for dielectric etching due to VHF's various benefits including low plasma potential, high electron density, and controllable dissociation. If the plasma is generated using multiple VHF sources, one can expect that the interaction between the sources can be important in determining the plasma characteristics. The effects of VHF mixing on plasma characteristics, especially its spatial profile, are investigated using both computational modeling and diagnostic experiments. The two-dimensional plasma model includes the full set of Maxwell equations in their potential formulation. The plasma simulation results show that electron density peaks at the center of the chamber at 180 MHz due to the standing electromagnetic wave. Electrostatic effects at the electrode edges tend to get stronger at lower VHFs such as 60 MHz. When the two rf sources are used simultaneously and power at 60 MHz is gradually increased, the ion flux becomes uniform and then transitions to peak at electrode edge. These results are corroborated by Langmuir probe measurements of ion saturation current. VHF mixing is therefore an effective method for dynamically controlling plasma uniformity. The plasma is stronger and more confined when the 60 MHz source is connected to the smaller bottom electrode compared to the top electrode.

Bera, Kallol; Rauf, Shahid; Ramaswamy, Kartik; Collins, Ken [Applied Materials, Inc., 974 E. Arques Ave., M/S 81517, Sunnyvale, California 94085 (United States)

2009-08-01T23:59:59.000Z

349

Sensing system for detection and control of deposition on pendant tubes in recovery and power boilers  

DOE Patents [OSTI]

A system for detection and control of deposition on pendant tubes in recovery and power boilers includes one or more deposit monitoring sensors operating in infrared regions of about 4 or 8.7 microns and directly producing images of the interior of the boiler, or producing feeding signals to a data processing system for information to enable a distributed control system by which the boilers are operated to operate said boilers more efficiently. The data processing system includes an image pre-processing circuit in which a 2-D image formed by the video data input is captured, and includes a low pass filter for performing noise filtering of said video input. It also includes an image compensation system for array compensation to correct for pixel variation and dead cells, etc., and for correcting geometric distortion. An image segmentation module receives a cleaned image from the image pre-processing circuit for separating the image of the recovery boiler interior into background, pendant tubes, and deposition. It also accomplishes thresholding/clustering on gray scale/texture and makes morphological transforms to smooth regions, and identifies regions by connected components. An image-understanding unit receives a segmented image sent from the image segmentation module and matches derived regions to a 3-D model of said boiler. It derives a 3-D structure the deposition on pendant tubes in the boiler and provides the information about deposits to the plant distributed control system for more efficient operation of the plant pendant tube cleaning and operating systems.

Kychakoff, George (Maple Valley, WA); Afromowitz, Martin A. (Mercer Island, WA); Hogle, Richard E. (Olympia, WA)

2008-10-14T23:59:59.000Z

350

Low Cost Power and Supply Noise Estimation and Control in Scan Testing of VLSI Circuits  

E-Print Network [OSTI]

. To achieve constant test power, first, we built a fast and accurate power model, which can estimate the shift power without logic simulation of the circuit. We also proposed an efficient and low power X-bit Filling process, which could potentially reduce both...

Jiang, Zhongwei

2012-02-14T23:59:59.000Z

351

Emissions, Monitoring and Control of Mercury from Subbituminous Coal-Fired Power Plants  

SciTech Connect (OSTI)

The Subbituminous Energy Coalition (SEC) identified a need to re-test stack gas emissions from power plants that burn subbituminous coal relative to compliance with the EPA mercury control regulations for coal-fired plants. In addition, the SEC has also identified the specialized monitoring needs associated with mercury continuous emissions monitors (CEM). The overall objectives of the program were to develop and demonstrate solutions for the unique emission characteristics found when burning subbituminous coals. The program was executed in two phases; Phase I of the project covered mercury emission testing programs at ten subbituminous coal-fired plants. Phase II compared the performance of continuous emission monitors for mercury at subbituminous coal-fired power plants and is reported separately. Western Research Institute and a number of SEC members have partnered with Eta Energy and Air Pollution Testing to assess the Phase I objective. Results of the mercury (Hg) source sampling at ten power plants burning subbituminous coal concluded Hg emissions measurements from Powder River Basin (PBR) coal-fired units showed large variations during both ICR and SEC testing. Mercury captures across the Air Pollution Control Devices (APCDs) present much more reliable numbers (i.e., the mercury captures across the APCDs are positive numbers as one would expect compared to negative removal across the APCDs for the ICR data). Three of the seven units tested in the SEC study had previously shown negative removals in the ICR testing. The average emission rate is 6.08 lb/TBtu for seven ICR units compared to 5.18 lb/TBtu for ten units in the SEC testing. Out of the ten (10) SEC units, Nelson Dewey Unit 1, burned a subbituminous coal and petcoke blend thus lowering the total emission rate by generating less elemental mercury. The major difference between the ICR and SEC data is in the APCD performance and the mercury closure around the APCD. The average mercury removal values across the APCDs are 2.1% and 39.4% with standard deviations (STDs) of 1990 and 75%, respectively for the ICR and SEC tests. This clearly demonstrates that variability is an issue irrespective of using 'similar' fuels at the plants and the same source sampling team measuring the species. The study also concluded that elemental mercury is the main Hg specie that needs to be controlled. 2004 technologies such as activated carbon injection (ACI) may capture up to 60% with double digit lb/MMacf addition of sorbent. PRB coal-fired units have an Hg input of 7-15 lb/TBtu; hence, these units must operate at over 60% mercury efficiency in order to bring the emission level below 5.8 lb/TBtu. This was non-achievable with the best technology available as of 2004. Other key findings include: (1) Conventional particulate collectors, such as Cold-side Electro-Static Precipitators (CESPs), Hot-side Electro-Static Precipitator (HESP), and Fabric Filter (FF) remove nearly all of the particulate bound mercury; (2) CESPs perform better highlighting the flue gas temperature effect on the mercury removal. Impact of speciation with flue gas cooling is apparent; (3) SDA's do not help in enhancing adsorption of mercury vapor species; and (4) Due to consistently low chlorine values in fuels, it was not possible to analyze the impact of chlorine. In summary, it is difficult to predict the speciation at two plants that burn the same fuel. Non-fuel issues, such as flue gas cooling, impact the speciation and consequently mercury capture potential.

Alan Bland; Kumar Sellakumar; Craig Cormylo

2007-08-01T23:59:59.000Z

352

Control of wind generator associated to a flywheel energy storage system  

Science Journals Connector (OSTI)

In this paper, a doubly fed variable speed wind induction generator connected to the grid associated to a flywheel energy storage system (FESS) is investigated. The dynamic behaviour of a wind generator, including the models of the wind turbine (aerodynamic), the doubly fed induction generator (DFIG), a ac/ac direct converter, the converter control (algorithm of VENTURINI) and the power control of this system, is studied. Also investigated is a control method of the FESS system, which consists of the classical squirrel-cage induction machine supplied off the variable speed wind generator (VSWG) through a rectifierinverter cascade arrangement. Simulation results obtained on the basis of the dynamic models of the wind generator are presented, for different operating points, to demonstrate the performance of the proposed system.

K. Ghedamsi; D. Aouzellag; E.M. Berkouk

2008-01-01T23:59:59.000Z

353

An intelligent neuro-fuzzy logic controller for induction generator based wind generation to improve power system stability  

Science Journals Connector (OSTI)

Power systems are non-linear and they are often subjected to random disturbances. This paper deals with the application of the intelligent neuro-fuzzy technique to the design of the robust power system stabiliser for power system oscillation damping enhancement in a wind turbine based power system network. The stabilising signal is computed in real time using suitable fuzzy membership functions depending upon the state of the generator on the speed-acceleration phase plane. These input signals are first characterised by a set of linguistic variables using fuzzy set notations. The fuzzy relation matrix, which gives the relationship between stabiliser inputs and stabiliser output, allows a set of fuzzy logic operations that are performed on stabiliser inputs to obtain the desired stabiliser output. The performance of the proposed controller is analysed in a single induction machine-infinite bus power system data subjected to various dynamic and transient disturbances. The proposed intelligent neuro-fuzzy control scheme exhibits a superior damping performance in comparison to the conventional controllers. Its simple architecture reduces the computational burden, thereby making it attractive for real-time implementation.

N. Albert Singh; K.A. Muraleedharan; K. Gomathy

2009-01-01T23:59:59.000Z

354

Modeling of ECM Controlled Series Fan-powered VAV Terminal Units  

E-Print Network [OSTI]

Semi-empirical models for series fan-powered variable air volume terminal units (FPTUs) were developed based on models of the primary, plenum, fan airflow and the fan power consumption. The experimental setups and test procedures were developed...

Yin, Peng

2011-10-21T23:59:59.000Z

355

A test case for implementing feedback control in a micro hydro power plant.  

E-Print Network [OSTI]

??Micro-hydro turbines generate power for small villages and industries in Afghanistan. They usually produce less than 100 kW of power. Currently the flow into the (more)

Suliman, Ahmad

2010-01-01T23:59:59.000Z

356

Research on the Dynamic Fuzzy Neural Network Control of Mine Power Grid Chaotic Oscillation System  

Science Journals Connector (OSTI)

The phenomenon of bifurcation and chaos occurs in mine power grid under certain conditions, showing as seemingly irregular ... a theoretical guidance to improving the stability of power grid, which is of great si...

Xiangqun Li; Hailin Pu; Hao Liu; Jianfeng Liu

2012-01-01T23:59:59.000Z

357

Proportional EMG Control of Ankle Plantar Flexion in a Powered Transtibial Prosthesis  

E-Print Network [OSTI]

The human calf muscle generates 80% of the mechanical work to walk throughout stance-phase, powered plantar flexion. Powered plantar flexion is not only important for walking energetics, but also to minimize the impact on ...

Wang, Jing

2013-01-01T23:59:59.000Z

358

Fabrication and testing of an infrared spectral control component for thermophotovoltaic power conversion applications  

E-Print Network [OSTI]

Thermophotovoltaic (TPV) power conversion is the direct conversion of thermal radiation to electricity. Conceptually, TPV power conversion is a very elegant means of energy conversion. A thermal source emits a radiative ...

O'Sullivan, Francis M. (Francis Martin), 1980-

2004-01-01T23:59:59.000Z

359

Frequency Control and Inertial Response Schemes for the Future Power Networks  

Science Journals Connector (OSTI)

Future power systems face several challenges: (i) the high penetration level of renewable energy from highly variable generators connected over power converters, (ii) several technologies for energy storage with ...

F. Gonzalez-Longatt

2014-01-01T23:59:59.000Z

360

Optimizing the Configuration and Control of a Novel Human-Powered Energy Harvesting System  

E-Print Network [OSTI]

human foot-strikes and power low-power wearable systems in a self-sustaining manner. Dielectric the energy produced by a user's foot strikes and drive a target wearable system in a self-sustaining manner

Potkonjak, Miodrag

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Locomotor adaptation to a powered ankle-foot orthosis depends on control method  

Science Journals Connector (OSTI)

We studied human locomotor adaptation to powered ankle-foot orthoses with the intent of identifying differences...

Stephen M Cain; Keith E Gordon

2007-12-01T23:59:59.000Z

362

REVIEW Of COMPUTERIZED PROCEDURE GUIDELINES FOR NUCLEAR POWER PLANT CONTROL ROOMS  

SciTech Connect (OSTI)

Computerized procedures (CPs) are recognized as an emerging alternative to paper-based procedures for supporting control room operators in nuclear power plants undergoing life extension and in the concept of operations for advanced reactor designs. CPs potentially reduce operator workload, yield increases in efficiency, and provide for greater resilience. Yet, CPs may also adversely impact human and plant performance if not designed and implemented properly. Therefore, it is important to ensure that existing guidance is sufficient to provide for proper implementation and monitoring of CPs. In this paper, human performance issues were identified based on a review of the behavioral science literature, research on computerized procedures in nuclear and other industries, and a review of industry experience with CPs. The review of human performance issues led to the identification of a number of technical gaps in available guidance sources. To address some of the gaps, we developed 13 supplemental guidelines to support design and safety. This paper presents these guidelines and the case for further research.

David I Gertman; Katya Le Blanc; Ronald L Boring

2011-09-01T23:59:59.000Z

363

The intermountain power project commissioning - Subsynchronous torsional interaction tests  

SciTech Connect (OSTI)

Subsyncronous torsional vibration as a result of electrochemical interaction between the HVDC controls and a turbine-generator was first discovered during the commissioning of the Square Butte Project in 1977. The level of interaction between the HVDC controls and the turbine-generator depends on several interacting factors: the characteristic torsional frequencies of the turbine-generator, the bandwidth of the HVDC controls and the relative strength of the connecting ac system. For the Intermountain Power Project (IPP), early analysis of these interacting factors indicated that there exist definite potential for subsynchronous oscillation to occur. The calculated torsional frequencies of the IPP units showed that the first mode frequency is 14.0 Hz and is within the typical bandwidth of an HVDC control which is between 10-20 Hz. The HVDC controls, therefore, can influence the torsional stability of the IPP units. Further, the IPP turbine-generators are required to operate isolated on the HVDC rectifier terminal, with no other interconnecting ac network. This ''radial'' mode of operation will result in maximum interaction between the converter station and the IPP units. It became obvious that special measure must be implemented in the design of the IPP HVDC control system to modify its typical characteristics to avoid the occurrence of the subsynchronous oscillation. This paper presents the results of the subsynchronous torsional interaction (SSTI) tests that were performed during the commissioning of the IPP Unit 1 and the HVDC Transmission system.

Wu, C.T.; Peterson, K.J. (Dept. of Water and Power, Los Angeles, CA (US)); Pinko, R.J.; Kankam, M.D.; Baker, D.H. (General Electric Co., Schenectady, NY (US))

1988-10-01T23:59:59.000Z

364

Nitrogen Isotopic Composition of Coal-Fired Power Plant NOx: Influence of Emission Controls and Implications for Global Emission  

E-Print Network [OSTI]

Nitrogen Isotopic Composition of Coal-Fired Power Plant NOx: Influence of Emission Controls and Implications for Global Emission Inventories J. David Felix,*, Emily M. Elliott, and Stephanie L. Shaw contributions, prior documentation of 15 N of various NOx emission sources is exceedingly limited

Elliott, Emily M.

365

2004 35th Annual lEEE Power Electronics Specialists Conference Aachen. Germany, 2004 Optimal Harmonic Elimination Control  

E-Print Network [OSTI]

fidelity and/or efficiency. For a variable frequency applications, e.g. motor drives, the optimal harmonic-phase inverter and a three-phase induction motor drive system. Ultimately, it is shown that there exists, in an uninterruptible power supply, the fixed output frequency might suggest that all harmonics be controlled

Chapman, Patrick

366

Optimal control system design of an acid gas removal unit for an IGCC power plants with CO2 capture  

SciTech Connect (OSTI)

Future IGCC plants with CO{sub 2} capture should be operated optimally in the face of disturbances without violating operational and environmental constraints. To achieve this goal, a systematic approach is taken in this work to design the control system of a selective, dual-stage Selexol-based acid gas removal (AGR) unit for a commercial-scale integrated gasification combined cycle (IGCC) power plant with pre-combustion CO{sub 2} capture. The control system design is performed in two stages with the objective of minimizing the auxiliary power while satisfying operational and environmental constraints in the presence of measured and unmeasured disturbances. In the first stage of the control system design, a top-down analysis is used to analyze degrees of freedom, define an operational objective, identify important disturbances and operational/environmental constraints, and select the control variables. With the degrees of freedom, the process is optimized with relation to the operational objective at nominal operation as well as under the disturbances identified. Operational and environmental constraints active at all operations are chosen as control variables. From the results of the optimization studies, self-optimizing control variables are identified for further examination. Several methods are explored in this work for the selection of these self-optimizing control variables. Modifications made to the existing methods will be discussed in this presentation. Due to the very large number of candidate sets available for control variables and due to the complexity of the underlying optimization problem, solution of this problem is computationally expensive. For reducing the computation time, parallel computing is performed using the Distributed Computing Server (DCS) and the Parallel Computing toolbox from Mathworks. The second stage is a bottom-up design of the control layers used for the operation of the process. First, the regulatory control layer is designed followed by the supervisory control layer. Finally, an optimization layer is designed. In this paper, the proposed two-stage control system design approach is applied to the AGR unit for an IGCC power plant with CO{sub 2} capture. Aspen Plus Dynamics is used to develop the dynamic AGR process model while MATLAB is used to perform the control system design and for implementation of model predictive control (MPC).

Jones, D.; Bhattacharyya, D.; Turton, R.; Zitney, S.

2012-01-01T23:59:59.000Z

367

MULTI-WATT ELECTRIC POWER FROM A MICROFABRICATED PERMANENT-MAGNET GENERATOR  

E-Print Network [OSTI]

MULTI-WATT ELECTRIC POWER FROM A MICROFABRICATED PERMANENT-MAGNET GENERATOR S. Das1 , D. P. Arnold2 presents the design, fabrication, and characterization of permanent-magnet (PM) generators for use, coupled to a transformer and rectifier, delivers 1.1 W of DC electrical power to a resistive load

368

Fuel Cell Powered Vehicles Using Supercapacitors: Device Characteristics, Control Strategies, and Simulation Results  

E-Print Network [OSTI]

using supercapacitors than batteries. The simulation resultsload-level control for batteries because of the lower lossesthe DC/DC converter and batteries, but load level control is

Zhao, Hengbing; Burke, Andy

2010-01-01T23:59:59.000Z

369

Exploring the practical issues and use of modern power, control and sensing circuitries of a 6/4-pole switched reluctance motor drive  

Science Journals Connector (OSTI)

This paper explores practical issues and use of modern power, control and sensing circuitries of a 6/4-pole Switched Reluctance Motor (SRM) drive. A DSP-based SRM drive system consists of classic bridge converter including power MOSFETs and their gate drivers, freewheeling diodes, sensing circuit, DSP controller and a SRM that is being controlled by the controller. Few logic components are also required that will interface with the DSP for communication. The complete practical issues experienced with modern power, control and sensing circuitries of a 6/4-pole SRM drive is presented.

Shanmugam Paramasivam; R. Arumugam

2007-01-01T23:59:59.000Z

370

The future of GPS-based electric power system measurements, operation and control  

SciTech Connect (OSTI)

Much of modern society is powered by inexpensive and reliable electricity delivered by a complex and elaborate electric power network. Electrical utilities are currently using the Global Positioning System-NAVSTAR (GPS) timekeeping to improve the network`s reliability. Currently, GPS synchronizes the clocks on dynamic recorders and aids in post-mortem analysis of network disturbances. Two major projects have demonstrated the use of GPS-synchronized power system measurements. In 1992, the Electric Power Research Institute`s (EPRI) sponsored Phase Measurements Project used a commercially available Phasor Measurements Unit (PMU) to collect GPS-synchronized measurements for analyzing power system problems. In 1995, Bonneville Power Administration (BPA) and Western Area Power Administration (WAPA) under DOE`s and EPRI`s sponsorship launched the Wide Area Measurements (WAMS) project. WAMS demonstrated GPS-synchronized measurements over a large area of their power networks and demonstrated the networking of GPS-based measurement systems in BPA and WAPA. The phasor measurement technology has also been used to conduct dynamic power system tests. During these tests, a large dynamic resistor was inserted to simulate a small power system disturbance.

Rizy, D.T. [Oak Ridge National Lab., TN (United States); Wilson, R.E. [Western Area Power Administration, Golden, CO (United States); Martin, K.E.; Litzenberger, W.H. [Bonneville Power Administration, Portland, OR (United States); Hauer, J.F. [Pacific Northwest National Lab., Richland, WA (United States); Overholt, P.N. [Dept. of Energy, Washington, DC (United States); Sobajic, D.J. [Electric Power Research Inst., Palo Alto, CA (United States)

1998-11-01T23:59:59.000Z

371

Security, trust, and QoS in next-generation control and communication for large power systems  

Science Journals Connector (OSTI)

The present communication architecture supporting control of the electric power grid makes it difficult to use the wealth of data collected at high rates in substations, retarding their use in new applications for controlling the grid. A flexible, real-time data network would make it possible to use these data for many more control and protection applications, potentially increasing the grid's reliability and increasing its operating efficiency. Applications that could use these data include: decentralised load frequency control; closed-loop voltage control; transient and small-signal stabilisation; and special protection schemes using data gathered over a wide area. Such applications and the flexibility of the underlying communication network imply greater data sharing between utilities, leading to new performance, availability and reliability requirements. This paper examines the security, trust and Quality of Service (QoS) requirements imposed by these applications and shows how they are met by mechanisms included in the GridStat middleware framework that we are developing.

Carl H. Hauser; David E. Bakken; Ioanna Dionysiou; K. Harald Gjermundrod; Venkata S. Irava; Joel Helkey; Anjan Bose

2008-01-01T23:59:59.000Z

372

Model predictive control system and method for integrated gasification combined cycle power generation  

SciTech Connect (OSTI)

Control system and method for controlling an integrated gasification combined cycle (IGCC) plant are provided. The system may include a controller coupled to a dynamic model of the plant to process a prediction of plant performance and determine a control strategy for the IGCC plant over a time horizon subject to plant constraints. The control strategy may include control functionality to meet a tracking objective and control functionality to meet an optimization objective. The control strategy may be configured to prioritize the tracking objective over the optimization objective based on a coordinate transformation, such as an orthogonal or quasi-orthogonal projection. A plurality of plant control knobs may be set in accordance with the control strategy to generate a sequence of coordinated multivariable control inputs to meet the tracking objective and the optimization objective subject to the prioritization resulting from the coordinate transformation.

Kumar, Aditya; Shi, Ruijie; Kumar, Rajeeva; Dokucu, Mustafa

2013-04-09T23:59:59.000Z

373

Initial Studies on Actionable Control for Improving Small Signal Stability in Interconnected Power Systems  

SciTech Connect (OSTI)

Power consumption and demand continues to grow around the world. As the electric power grid continues to be put under more stress, the conditions of instability are more likely to occur. One cause of such instabilities is intearea oscillations, such as the oscillation that resulted in the August 10, 1996 blackout of the WECC. This paper explores different potential operations of different devices on the power system to improve the damping of these interarea oscillations using two different simulation models

Tuffner, Francis K.; Huang, Zhenyu; Zhou, Ning; Guttromson, Ross T.; Jayantilal, Avnaesh

2010-06-14T23:59:59.000Z

374

Direct Cooled Ceramic Substrate for Thermal Control of Automotive Power Electronics.  

E-Print Network [OSTI]

??As electric vehicle technology develops, manufacturers would like to move toward hotter coolants for power electronic components to reduce system level costs. Thus, unique designs (more)

Lowe, Kirk Townsend

2009-01-01T23:59:59.000Z

375

Developement of a digitally controlled low power single phase inverter for grid connected solar panel.  

E-Print Network [OSTI]

?? The work consists in developing a power conversion unit for solar panel connected to the grid. This unit will be a single phase inverter (more)

Marguet, Raphael

2010-01-01T23:59:59.000Z

376

Enhanced control of DFIG-based wind power plants to comply with the international grid codes.  

E-Print Network [OSTI]

??A review of the latest international grid codes shows that large wind power plants are stipulated to not only ride-through various fault conditions, but also (more)

Mohseni, Mansour

2011-01-01T23:59:59.000Z

377

Thin-Film Fiber Optic Sensors for Power Control and Fault Detection. Final Report  

SciTech Connect (OSTI)

Described is the development of an optical current measurement device, an active power conditioning system, and sol gel type thin films for the detection of magnetic fields.

Duncan, Paul Grems

2003-09-30T23:59:59.000Z

378

Torque-Power-Speed Hybrid Control of Marine Electric Propulsion System  

Science Journals Connector (OSTI)

The conventional electric propulsion system is usually aimed at controlling the shaft speed only, without taking advantages of the electric propulsion motor into control strategies. This paper designs a SSP for marine electric propulsion system with ... Keywords: control, ship, marine electric propulsion, hybrid control

Guichen Zhang; Jie Ma

2010-05-01T23:59:59.000Z

379

Particle Swarm Optimization and Gradient Descent Methods for Optimization of PI Controller for AGC of Multi-area Thermal-Wind-Hydro Power Plants  

Science Journals Connector (OSTI)

The automatic generation control (AGC) of three unequal interconnected Thermal, Wind and Hydro power plant has been designed with PI controller. Further computational intelligent technique Particle Swarm Optimization and conventional Gradient Descent ... Keywords: Automatic generation control, Particle swarm optimization, Gradient Descent method, Generation rate constraint, Area control error, Wind energy conversion system

Naresh Kumari; A N. Jha

2013-04-01T23:59:59.000Z

380

Robust nonlinear model predictive control for nuclear power plants in load following operations with bounded xenon oscillations  

Science Journals Connector (OSTI)

One of the important operations in nuclear power plants is load-following in which imbalance of axial power distribution induces xenon oscillations. These oscillations must be maintained within acceptable limits otherwise the nuclear power plant could become unstable. Therefore, bounded xenon oscillation considered to be a constraint for the load-following operation. In this paper, a robust nonlinear model predictive control for the load-following operation problem is proposed that ensures xenon oscillations are kept bounded within acceptable limits. The proposed controller uses constant axial offset (AO) strategy to maintain xenon oscillations to be bounded. The constant AO is a robust state constraint for load-following problem. The controller imposes restricted state constraints on the predicted trajectory during optimization which guarantees robust satisfaction of state constraints without restoring to a minmax optimization problem. Simulation results show that the proposed controller for the load-following operation is so effective so that the xenon oscillations kept bounded in the given region.

H. Eliasi; M.B. Menhaj; H. Davilu

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Bonneville Power Administration is investigating wide-area stability and voltage control. The control provides a flexible  

E-Print Network [OSTI]

. There will also be synergy between wide-area control and substation automation (e.g., intelligent electronic Adminis- tration (BPA). For the past decade, wintertime voltage stability has been a major concern [1

Venkatasubramanian, Mani V.

382

PILOT-AND FULL-SCALE DEMONSTRATION OF ADVANCED MERCURY CONTROL TECHNOLOGIES FOR LIGNITE-FIRED POWER PLANTS  

SciTech Connect (OSTI)

North Dakota lignite-fired power plants have shown a limited ability to control mercury emissions in currently installed electrostatic precipitators (ESPs), dry scrubbers, and wet scrubbers (1). This low level of control can be attributed to the high proportions of Hg{sup 0} present in the flue gas. Speciation of Hg in flue gases analyzed as part of the U.S. Environmental Protection Agency (EPA) information collection request (ICR) for Hg data showed that Hg{sup 0} ranged from 56% to 96% and oxidized mercury ranged from 4% to 44%. The Hg emitted from power plants firing North Dakota lignites ranged from 45% to 91% of the total Hg, with the emitted Hg being greater than 85% elemental. The higher levels of oxidized mercury were only found in a fluidized-bed combustion system. Typically, the form of Hg in the pulverized and cyclone-fired units was dominated by Hg{sup 0} at greater than 85%, and the average amount of Hg{sup 0} emitted from North Dakota power plants was 6.7 lb/TBtu (1, 2). The overall objective of this Energy & Environmental Research Center (EERC) project is to develop and evaluate advanced and innovative concepts for controlling Hg emissions from North Dakota lignite-fired power plants by 50%-90% at costs of one-half to three-fourths of current estimated costs. The specific objectives are focused on determining the feasibility of the following technologies: Hg oxidation for increased Hg capture in wet and dry scrubbers, incorporation of additives and technologies that enhance Hg sorbent effectiveness in ESPs and baghouses, the use of amended silicates in lignite-derived flue gases for Hg capture, and the use of Hg adsorbents within a baghouse. The scientific approach to solving the problems associated with controlling Hg emissions from lignite-fired power plants involves conducting testing of the following processes and technologies that have shown promise on a bench, pilot, or field scale: (1) activated carbon injection (ACI) upstream of an ESP combined with sorbent enhancement, (2) Hg oxidation and control using wet and dry scrubbers, (3) enhanced oxidation at a full-scale power plant using tire-derived fuel (TDF) and oxidizing catalysts, and (4) testing of Hg control technologies in the Advanced Hybrid{trademark} filter insert.

Steven A. Benson; Charlene R. Crocker; Kevin C. Galbreath; Jay R. Gunderson; Mike J. Holmes; Jason D. Laumb; Michelle R. Olderbak; John H. Pavlish; Li Yan; Ye Zhuang; Jill M. Zola

2004-02-01T23:59:59.000Z

383

Redundant Sensor Calibration and Estimation for Monitoring and Control of Nuclear Power Plants Xin Jin, Asok Ray and Robert M. Edwards  

E-Print Network [OSTI]

Redundant Sensor Calibration and Estimation for Monitoring and Control of Nuclear Power Plants Xin@engr.psu.edu INTRODUCTION Performance, reliability and safety of nuclear power plants depend upon validity and accuracy are installed with redundancy in nuclear power plants. Redundancy can be classified into two groups: direct

Ray, Asok

384

Distributed Low-Complexity Controller for Wind Power Plant in Derated Benjamin Biegel Daria Madjidian Vedrana Spudic Anders Rantzer Jakob Stoustrup  

E-Print Network [OSTI]

Distributed Low-Complexity Controller for Wind Power Plant in Derated Operation Benjamin Biegel Daria Madjidian Vedrana Spudi´c Anders Rantzer Jakob Stoustrup Abstract-- We consider a wind power plant of megawatt wind turbines operating in derated mode. When operating in this mode, the wind power plant

385

1558 IEEE TRANSACTIONS ON MAGNETICS,VOL. 29, NO. 2, MARCH 1993 Control of an Induction Heat Treatment by the Measure of Power  

E-Print Network [OSTI]

heated. The heating stage is controlled by regulatingboth the power supplied to the coil and the linear1558 IEEE TRANSACTIONS ON MAGNETICS,VOL. 29, NO. 2, MARCH 1993 Control of an Induction Heat Treatment by the Measure of Power D. Melaab, 0.Longeot ENSAM, LAMMAR, 33405 Bordeaux, France L. Krahenbiihl

Paris-Sud XI, Université de

386

Abstract--This paper revisits the possibility of controlling the power system entirely by means of price signals. It expands on  

E-Print Network [OSTI]

Abstract-- This paper revisits the possibility of controlling the power system entirely by means, be made to work with some caveats. Index Terms--Power system control, pricing, market design. I. An important extension of the work of Schweppe was provided by William Hogan, who in 1992 introduced

387

Western Area Power Administration's Control and Administration of American Recovery and Reinvestment Act Borrowing Authority, OAS-RA-12-01  

Broader source: Energy.gov (indexed) [DOE]

Management Alert Management Alert Western Area Power Administration's Control and Administration of American Recovery and Reinvestment Act Borrowing Authority OAS-RA-12-01 November 2011 Department of Energy Washington, DC 20585 November 4, 2011 MEMORANDUM FOR THE ADMINISTRATOR, WESTERN AREA POWER ADMINISTRATION FROM: Gregory H. Friedman Inspector General SUBJECT: INFORMATION: Management Alert on "The Western Area Power Administration's Control and Administration of American Recovery and Reinvestment Act Borrowing Authority" IMMEDIATE CONCERN Despite internal control and administration issues with its first project authorized under its $3.25 billion American Recovery and Reinvestment Act of 2009 (Recovery Act) borrowing authority, the Department of Energy's (Department) Western Area Power Administration

388

Magnet. Part VIPower Supply  

Science Journals Connector (OSTI)

The power for the Cosmotron magnet is supplied by a 1750?hp 13 800?volt induction motor that drives a 21 000?kva 12?phase ac generator and a 43?ton flywheel rotating at approximately 900 rpm. The generator output is rectified through 24 double?grid ignitrons which also act as inverters returning most of the magnetic energy of the coil to the rotating set.

G. K. Green; E. E. Shelton

1953-01-01T23:59:59.000Z

389

Internal, powerful others, and chance locus of control as related to performance in a concept identification task  

E-Print Network [OSTI]

fcclfill . ent of thc require!!cent for tn: drgr=. c f RASTER OF SCIENCE August 1975 Major Subject: Psychology L INTERNAL, POWERFUL OTHERS, AND CHANCE LOCUS OF CONTROL AS RELATED TO PERFORMANCE IN A CONCEPT IDENTIFICATION TASK A Thesis Thomas Gray... INIHODUCTION Hypotheses 10 METHOD 12 Subj ects Procedures 12 12 Instructional Set 13 Transfer Instructions Miterisls RES UI. 'I S 39 DISCUSSION 7F Ro"'ERFNCES 37 APPENDICES 1. Stimulus Materials In Acquisition 2. Stimulus Materials In Transfer...

Allen, Thomas Gray

1975-01-01T23:59:59.000Z

390

www.jatit.org ARTIFICIAL INTELLIGENCE BASED TUNING OF SVC CONTROLLER FOR CO-GENERATED POWER SYSTEM  

E-Print Network [OSTI]

The gain of SVC depends upon the type of reactive power load for optimum performance. As the load and input wind power conditions are variable, the gain setting of SVC needs to be adjusted or tuned. In this paper, an ANN based approach has been used to tune the gain parameters of the SVC controller over a wide range of load characteristics. The multi-layer feed-forward ANN tool with the error backpropagation training method is employed. Loads have been taken as the function of voltage. Analytical techniques have mostly been based on impedance load reduced network models, which suffer from several disadvantages, including inadequate load representation and lack of structural integrity. The ability of ANNs to spontaneously learn from examples, reason over inexact and fuzzy data and provide adequate and quick responses to new information not previously stored in memory has generated high performance dynamical system with unprecedented robustness. ANNs models have been developed for different hybrid power system configurations for tuning the proportional-integral controller for SVC. Transient responses of different autonomous configurations show that SVC controller with its gained tuned by the ANNs provide optimum system performance for a variety of loads.

Vinod Kumar

391

Integration of Green Energy into Power Distribution Systems: Study of Impacts and Development of Control Methodology  

Science Journals Connector (OSTI)

Distributed generation (DG) is gaining popularity as it has a positive environmental impact and the capability to reduce high transmission costs and power losses. Although the integration of renewable energy-base...

N. K. Roy; H. R. Pota

2014-01-01T23:59:59.000Z

392

E-Print Network 3.0 - active power control Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Information Sciences ; Engineering 12 It is not just a job its a WINDTEST Wind Energy with Power Plant Properties?WINDTEST Summary: -Wilhelm-Koog GmbH 12;1. Introduction...

393

A neuromuscular-model based control strategy for powered ankle-foot prostheses  

E-Print Network [OSTI]

In the development of a powered ankle-foot prosthesis, it is desirable to provide the prosthesis with the ability to exhibit human-like dynamics. A simple method for achieving this goal involves trajectory tracking, where ...

Eilenberg, Michael Frederick

2009-01-01T23:59:59.000Z

394

Regulatory Control of Vehicle and Power Plant Emissions: How Effective and at What Cost?  

E-Print Network [OSTI]

Passenger vehicles and power plants are major sources of greenhouse gas emissions. While economic analyses generally indicate that a broader market-based approach to greenhouse gas reduction would be less costly and more ...

Paltsev, S.

395

Analysis and design of closed-loop control of power electronic converter systems  

E-Print Network [OSTI]

filter system to cancel neutral current harmonic (IOOA) in a threephase four-wire electric distribution system. (b)Input power factor correction and harmonic reduction stage of a commercially available electronic ballast (12OV, 64W) for fluorescent...

Huang, Yenchin

2012-06-07T23:59:59.000Z

396

Novel Controls for Economic Dispatch of Combined Cooling, Heating and Power (CCHP) Systems  

Broader source: Energy.gov [DOE]

The emergence of technologies that efficiently convert heat into cooling, such as absorption chillers, has opened up many new opportunities and markets for combined heat and power systems. These...

397

Emissions, Monitoring, and Control of Mercury from Subbituminous Coal-Fired Power Plants - Phase II  

SciTech Connect (OSTI)

Western Research Institute (WRI), in conjunction with Western Farmers Electric Cooperative (WFEC), has teamed with Clean Air Engineering of Pittsburgh PA to conduct a mercury monitoring program at the WEFC Hugo plant in Oklahoma. Sponsored by US Department of Energy Cooperative Agreement DE-FC-26-98FT40323, the program included the following members of the Subbituminous Energy Coalition (SEC) as co-sponsors: Missouri Basin Power Project; DTE Energy; Entergy; Grand River Dam Authority; and Nebraska Public Power District. This research effort had five objectives: (1) determine the mass balance of mercury for subbituminous coal-fired power plant; (2) assess the distribution of mercury species in the flue gas (3) perform a comparison of three different Hg test methods; (4) investigate the long-term (six months) mercury variability at a subbituminous coal-fired power plant; and (5) assess operation and maintenance of the Method 324 and Horiba CEMS utilizing plant personnel.

Alan Bland; Jesse Newcomer; Allen Kephart; Volker Schmidt; Gerald Butcher

2008-10-31T23:59:59.000Z

398

Affecting the Gross Cooling Power of a Pulse Tube Cryocooler with Mass Flow Control  

Science Journals Connector (OSTI)

To increase the cooling capacity of a pulse tube cryocooler the ... For a given pulse tube volume the gross cooling power is limited. Since the cooling effect originates from the phase shift angle ... we present ...

A. Waldauf; T. Schmauder; M. Thrk; P. Seidel

2003-01-01T23:59:59.000Z

399

Variable-Speed Wind Generator System with Maximum Output Power Control  

Science Journals Connector (OSTI)

To achieve maximum output power from wind generator systems, the rotational speed of wind generators should be adjusted in real time according to natural wind speed. This chapter pays attention to an optimum rota...

Yoko Amano

2013-01-01T23:59:59.000Z

400

Investigation on Control Issues in Power Converters for Advanced Micro-Grid Operations  

Science Journals Connector (OSTI)

This paper investigates a novel design concept, in which a hybrid power interface system (HPIS) is constructed to work smartly in various micro-grid (MG) operations. Some distributed generation (...

Tsao-Tsung Ma

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Technological developments to improve combustion efficiency and pollution control in coal-fired power stations in Japan  

SciTech Connect (OSTI)

In 1975, approximately 60 percent of all power generating facilities in Japan were oil fired. The oil crisis in the 1970s, however, led Japanese power utilities to utilize alternatives to oil as energy sources, including nuclear power, coal, LNG, and others. As a result, by 1990, the percentage of oil-fired power generation facilities had declined to approximately 31 percent. On the other hand, coal-fired power generation, which accounted for 5.7 percent of all facilities in 1975, increased its share to 7.5 percent in 1990 and is anticipated to expand further to 13 percent by the year 2000. In order to increase the utilization of coal-fired power generation facilities in Japan, it is necessary to work out thorough measures to protect the environment, mainly to control air pollution. The technologies that are able to do this are already available. The second issue is how to improve efficiency. In this chapter, I would like to introduce technological developments that improve efficiency and that protect the environment which have been implemented in coal-fired power stations in Japan. Examples of the former, include the atmospheric fluidized bed combustion (AFBC) boiler, the pressurized fluidized bed combustion (PFBC) boiler, and the ultra super-critical (USC) steam condition turbine, and an example of the latter is the dry deSOx/deNOx. Although details are not provided in this paper, there are also ongoing projects focusing on the development of technology for integrated gasification combined cycle generation, fuel cells and other systems undertaken by the government, i.e., the Ministry of International Trade and Industry (MITI), which is committed to the New Energy and Industrial Technology Development Organization (NEDO).

Miyasaka, Tadahisa

1993-12-31T23:59:59.000Z

402

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network [OSTI]

77 5.2 Wind Energy Conversion System . . . . .Optimization and Control in Wind Energy Conversion SystemsAC matrix con- verter for wind energy conversion system, in

Ghaffari, Azad

2013-01-01T23:59:59.000Z

403

Fuel Cell Powered Vehicles Using Supercapacitors: Device Characteristics, Control Strategies, and Simulation Results  

E-Print Network [OSTI]

and simulation of a PEM fuel cell/ultra-capacitor hybridOptimal Control for a PEM Fuel Cell Hybrid Vehicle,

Zhao, Hengbing; Burke, Andy

2010-01-01T23:59:59.000Z

404

Modelling and control of multi-terminal HVDC networks for offshore wind power generation.  

E-Print Network [OSTI]

??Due to the recent developments in semiconductors and control equipment, Voltage Source Converter based High Voltage Direct Current (VSC-HVDC) becomes a promising technology for grid (more)

Zhou, Shu

2011-01-01T23:59:59.000Z

405

PhotoVoltaic distributed generation for Lanai power grid real-time simulation and control integration scenario.  

SciTech Connect (OSTI)

This paper discusses the modeling, analysis, and testing in a real-time simulation environment of the Lanai power grid system for the integration and control of PhotoVoltaic (PV) distributed generation. The Lanai Island in Hawaii is part of the Hawaii Clean Energy Initiative (HCEI) to transition to 30% renewable green energy penetration by 2030. In Lanai the primary loads come from two Castle and Cook Resorts, in addition to residential needs. The total peak load profile is 12470 V, 5.5 MW. Currently there are several diesel generators that meet these loading requirements. As part of the HCEI, Lanai has initially installed 1.2 MW of PV generation. The goal of this study has been to evaluate the impact of the PV with respect to the conventional carbon-based diesel generation in real time simulation. For intermittent PV distributed generation, the overall stability and transient responses are investigated. A simple Lanai 'like' model has been developed in the Matlab/Simulink environment (see Fig. 1) and to accommodate real-time simulation of the hybrid power grid system the Opal-RT Technologies RT-Lab environment is used. The diesel generators have been modelled using the SimPowerSystems toolbox swing equations and a custom Simulink module has been developed for the High level PV generation. All of the loads have been characterized primarily as distribution lines with series resistive load banks with one VAR load bank. Three-phase faults are implemented for each bus. Both conventional and advanced control architectures will be used to evaluate the integration of the PV onto the current power grid system. The baseline numerical results include the stable performance of the power grid during varying cloud cover (PV generation ramping up/down) scenarios. The importance of assessing the real-time scenario is included.

Robinett, Rush D., III; Kukolich, Keith (Opal RT Technologies, Montreal, Quebec, Canada); Wilson, David Gerald; Schenkman, Benjamin L.

2010-06-01T23:59:59.000Z

406

Plasma sweeper to control the coupling of RF power to a magnetically confined plasma  

DOE Patents [OSTI]

A device for coupling RF power (a plasma sweeper) from a phased waveguide array for introducing RF power to a plasma having a magnetic field associated therewith comprises at least one electrode positioned near the plasma and near the phased waveguide array; and a potential source coupled to the electrode for generating a static electric field at the electrode directed into the plasma and having a component substantially perpendicular to the plasma magnetic field such that a non-zero vector cross-product of the electric and magnetic fields exerts a force on the plasma causing the plasma to drift.

Motley, Robert W. (Princeton, NJ); Glanz, James (Lawrenceville, NJ)

1985-01-01T23:59:59.000Z

407

Using muscle-powered swimming robots to explore how muscles control animal movement  

E-Print Network [OSTI]

(OC), Mikhaila Marecki, Chris Clemente #12;#12;Shoulder Elbow Wrist Vertebrate diversity = Variations) Make use of computer simulations Make use of robotic instruments Collect as much data from each animal (2007) JEB. 210:3147-3159 In vivo limb instrumentation: PL power PL work Neural activation #12

Richards, Chris

408

Delay Bounded Rate and Power Control in Energy Harvesting Wireless Networks  

E-Print Network [OSTI]

in environmentally powered wireless networks with bursty packet arrivals. Varying the size of the energy storage unit such as solar energy, mechanical energy and thermal energy have started finding use in wireless sensor networks, followed by an energy storage unit. The energy harvested by the front end is stored in the storage unit

Rajan, Dinesh

409

An Analytical Approach for Closed-Loop Power Control Error Estimations in CDMA Cellular Systems  

E-Print Network [OSTI]

(PCE). The power emitted by a mobile terminal is limited by tech- nological and normative constraints con- tributes to PCE. The distribution of PCE is often assumed log-normal [7],[8],[9], nevertheless, a more accurate statisti- cal characterization of PCE is desirable in order to evaluate the suitability

Abrardo, Andrea

410

A MAC Protocol for Wireless Ad Hoc Networks with Power Control  

E-Print Network [OSTI]

is an important factor in ad hoc networks. One way to conserve energy supported by the standard [1] is the power-hop neighborhood. Through many simulations we show that our algorithm outperforms the IEEE 802.11 standard, also IEEE 802.11 [1] has become the standard for Wire- less LAN's both in infrastructure and in ad hoc mode

411

Stochastic Six-Degree-of-Freedom Flight Simulator for Passively Controlled High-Power Rockets  

E-Print Network [OSTI]

are alternatively powered by hybrid motors using a liquid oxidizer, e.g., nitrous Oxide N2O and a solid fuel, e historical atmospheric data. The core simulation algorithm is a numerical integration of the rocket's equations of motion using the Runge-Kutta-Fehlberg method. The position of the rocket's center of mass

Bishop, Christopher M.

412

Underground nuclear power station using self-regulating heat-pipe controlled reactors  

DOE Patents [OSTI]

A nuclear reactor for generating electricity is disposed underground at the bottom of a vertical hole that can be drilled using conventional drilling technology. The primary coolant of the reactor core is the working fluid in a plurality of thermodynamically coupled heat pipes emplaced in the hole between the heat source at the bottom of the hole and heat exchange means near the surface of the earth. Additionally, the primary coolant (consisting of the working flud in the heat pipes in the reactor core) moderates neutrons and regulates their reactivity, thus keeping the power of the reactor substantially constant. At the end of its useful life, the reactor core may be abandoned in place. Isolation from the atmosphere in case of accident or for abandonment is provided by the operation of explosive closures and mechanical valves emplaced along the hole. This invention combines technology developed and tested for small, highly efficient, space-based nuclear electric power plants with the technology of fast-acting closure mechanisms developed and used for underground testing of nuclear weapons. This invention provides a nuclear power installation which is safe from the worst conceivable reactor accident, namely, the explosion of a nuclear weapon near the ground surface of a nuclear power reactor.

Hampel, Viktor E. (Pleasanton, CA)

1989-01-01T23:59:59.000Z

413

Study on the Control Scheme of DFIG Wind Power System with Super Capacitors under Nonlinear Load  

Science Journals Connector (OSTI)

Wind energy is a kind of clean renewable energy resource with the characteristic of intermittent, fluctuant and stochastic, highly depends on the weather condition. The adoption of energy storage device based on super capacitors is an efficient way to ... Keywords: doubly fed induction generator, wind power, converter, super capacitors

Lingyun Wang; Li Huang; Jian Sun; Juan Meng

2012-05-01T23:59:59.000Z

414

Optimal Power Management in Wireless Control Systems Konstantinos Gatsis, Alejandro Ribeiro and George J. Pappas  

E-Print Network [OSTI]

but a separation principle for finite horizon costs can be established [11], and optimal plant and transmission the sensor. The power allocated to these transmissions determines the probability of successful reception of transmissions protected with capacity achieving codes, conventional event-triggered policies are recovered

Pappas, George J.

415

The slow start power controlled MAC protocol for mobile ad hoc networks and its performance analysis  

E-Print Network [OSTI]

is achieved by allowing more transmissions to take place simultaneously. The slow start principle used energy consumption and increase network throughput and lifetime. In our scheme the transmission power used for the RTS frames is not constant, but follows a slow start principle. The CTS frames, which

Varvarigo, Emmanouel "Manos"

416

An underground nuclear power station using self-regulating heat-pipe controlled reactors  

DOE Patents [OSTI]

A nuclear reactor for generating electricity is disposed underground at the bottom of a vertical hole that can be drilled using conventional drilling technology. The primary coolant of the reactor core is the working fluid in a plurality of thermodynamically coupled heat pipes emplaced in the hole between the heat source at the bottom of the hole and heat exchange means near the surface of the earth. Additionally, the primary coolant (consisting of the working fluid in the heat pipes in the reactor core) moderates neutrons and regulates their reactivity, thus keeping the power of the reactor substantially constant. At the end of its useful life, the reactor core may be abandoned in place. Isolation from the atmosphere in case of accident or for abandonment is provided by the operation of explosive closures and mechanical valves emplaced along the hole. This invention combines technology developed and tested for small, highly efficient, space-based nuclear electric power plants with the technology of fast- acting closure mechanisms developed and used for underground testing of nuclear weapons. This invention provides a nuclear power installation which is safe from the worst conceivable reactor accident, namely, the explosion of a nuclear weapon near the ground surface of a nuclear power reactor. 5 figs.

Hampel, V.E.

1988-05-17T23:59:59.000Z

417

Supervisory hybrid model predictive control for voltage stability of power networks  

E-Print Network [OSTI]

on the predicted behavior of a model featuring hybrid dynamics of the loads and the generation system. I (via solar energy or wind energy installations) will start to feed electricity into the network [2 continuous dynamics and discrete events, i.e., power systems exhibit hybrid behavior. Components

Paris-Sud XI, Université de

418

Modeling and Control of Co-generation Power Plants: A Hybrid System Approach  

E-Print Network [OSTI]

cycle is driven by some fossil fuel (usually natural gas) and produces electric power via expansion of the gas turbine and generates both electricity and steam for the industrial processes. Clearly, the liberalization of the energy market has promoted the need of operating CCPPs in the most efficient way

Ferrari-Trecate, Giancarlo

419

pahwa@ksu.edu Holonic Multi-agent Control of Power Distribution Systems of the Future  

E-Print Network [OSTI]

-75008 PARIS CIGRE US National Committee http : //www.cigre.org 2012 Grid of the Future Symposium #12;1 1 Grid [1,2] technology into the PDS, new challenges and opportunities are emerging. Smart Grid SUMMARY Power distribution systems (PDS) of the future will have homes with smart meters to monitor energy

Singh, Gurdip

420

Capacitor charging FET switcher with controller to adjust pulse width  

DOE Patents [OSTI]

A switching power supply includes an FET full bridge, a controller to drive the FETs, a programmable controller to dynamically control final output current by adjusting pulse width, and a variety of protective systems, including an overcurrent latch for current control. Power MOSFETS are switched at a variable frequency from 20-50 kHz to charge a capacitor load from 0 to 6 kV. A ferrite transformer steps up the DC input. The transformer primary is a full bridge configuration with the FET switches and the secondary is fed into a high voltage full wave rectifier whose output is connected directly to the energy storage capacitor. The peak current is held constant by varying the pulse width using predetermined timing resistors and counting pulses. The pulse width is increased as the capacitor charges to maintain peak current. A digital ripple counter counts pulses, and after the desired number is reached, an up-counter is clocked. The up-counter output is decoded to choose among different resistors used to discharge a timing capacitor, thereby determining the pulse width. A current latch shuts down the supply on overcurrent due to either excessive pulse width causing transformer saturation or a major bridge fault, i.e., FET or transformer failure, or failure of the drive circuitry.

Mihalka, Alex M. (Livermore, CA)

1986-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Power requirements for electron cyclotron current drive and ion cyclotron resonance heating for sawtooth control in ITER  

E-Print Network [OSTI]

13MW of electron cyclotron current drive (ECCD) power deposited inside the q = 1 surface is likely to reduce the sawtooth period in ITER baseline scenario below the level empirically predicted to trigger neo-classical tearing modes (NTMs). However, since the ECCD control scheme is solely predicated upon changing the local magnetic shear, it is prudent to plan to use a complementary scheme which directly decreases the potential energy of the kink mode in order to reduce the sawtooth period. In the event that the natural sawtooth period is longer than expected, due to enhanced alpha particle stabilisation for instance, this ancillary sawtooth control can be provided from > 10MW of ion cyclotron resonance heating (ICRH) power with a resonance just inside the q = 1 surface. Both ECCD and ICRH control schemes would benefit greatly from active feedback of the deposition with respect to the rational surface. If the q = 1 surface can be maintained closer to the magnetic axis, the efficacy of ECCD and ICRH schemes sig...

Chapman, I T; Sauter, O; Zucca, C; Asunta, O; Buttery, R J; Coda, S; Goodman, T; Igochine, V; Johnson, T; Jucker, M; La Haye, R J; Lennholm, M; Contributors, JET-EFDA

2013-01-01T23:59:59.000Z

422

Gain-scheduled controller design for load-following in static space nuclear power systems  

E-Print Network [OSTI]

of variations in the fuel temperature reactivity feedback coeficient on the load-following capabilities of the SNPS. Robustness analysis results of the gain-scheduled compensator demonstrate that the proposed control concept exhibits a significant degree...

Onbasioglu, Fetiye Ozlem

1993-01-01T23:59:59.000Z

423

Relaxed Laser Control of Uncooled MIMO DWDM Systems for Low Power Consumption Datacommunication Links  

E-Print Network [OSTI]

to be designed with extremely tight wavelength tolerances, typically within 0.1 nm [7], resulting in higher system infrastructure and maintenance cost. Precise wavelength control in WDM systems is typically achieved through the use of a Peltier Thermo...

von Lindeiner, J. B.; Ingham, J. D.; Penty, R. V.; White, I. H.

2014-01-01T23:59:59.000Z

424

Variable speed wind turbine for maximum power capture using adaptive fuzzy integral sliding mode control  

Science Journals Connector (OSTI)

This paper presents a nonlinear control approach to variable speed wind turbine (VSWT) with a wind speed estimator. The dynamics of the wind turbine (WT) is derived from single ... has been considered for exact e...

Saravanakumar Rajendran

2014-06-01T23:59:59.000Z

425

Controlling market power and price spikes in electricity networks: Demand-side bidding  

Science Journals Connector (OSTI)

...controlled data set with...competition on transmission lines connecting...demand from outages are ignored. Other...losses in transmission and any line constraints...14 days of data by level...when the transmission lines...

Stephen J. Rassenti; Vernon L. Smith; Bart J. Wilson

2003-01-01T23:59:59.000Z

426

Design, Modeling, and Control of Three-Port Converters for Solar Power Applications.  

E-Print Network [OSTI]

??This paper describes the results of research into multi-port converter design and control, specifically a pair of three-port topologies based on the half-bridge and full-bridge (more)

Reese, Justin M

2007-01-01T23:59:59.000Z

427

Assessment of energy and economic impacts of particulate-control technologies in coal-fired power generation  

SciTech Connect (OSTI)

Under contract to Argonne National Laboratory, Midwest Research Institute has derived models to assess the economic and energy impacts of particulate-control systems for coal-fired power plants. The models take into account the major functional variables, including plant size and location, coal type, and applicable particulate-emission standards. The algorithms obtained predict equipment and installation costs, as well as operating costs (including energy usage), for five control devices: (1) cold-side electrostatic precipitators, (2) hot-side electrostatic precipitators, (3) reverse-flow baghouses, (4) shake baghouses, and (5) wet scrubbers. A steam-generator performance model has been developed, and the output from this model has been used as input for the control-device performance models that specify required design and operating parameters for the control systems under study. These parameters then have been used as inputs to the cost models. Suitable guideline values have been provided for independent variables wherever necessary, and three case studies are presented to demonstrate application of the subject models. The control-equipment models aggregate the following cost items: (1) first costs (capital investment), (2) total, first-year annualized costs, and (3) integrated cost of ownership and operation over any selected plant lifetime. Although the models have been programmed for rapid computation, the algorithms can be solved with a hand calculator.

Not Available

1980-04-01T23:59:59.000Z

428

Power system  

DOE Patents [OSTI]

A power system includes a prime mover, a transmission, and a fluid coupler having a selectively engageable lockup clutch. The fluid coupler may be drivingly connected between the prime mover and the transmission. Additionally, the power system may include a motor/generator drivingly connected to at least one of the prime mover and the transmission. The power-system may also include power-system controls configured to execute a control method. The control method may include selecting one of a plurality of modes of operation of the power system. Additionally, the control method may include controlling the operating state of the lockup clutch dependent upon the mode of operation selected. The control method may also include controlling the operating state of the motor/generator dependent upon the mode of operation selected.

Hickam, Christopher Dale (Glasford, IL)

2008-03-18T23:59:59.000Z

429

Microwave and millimeter-wave rectifying circuit arrays and ultra-wideband antennas for wireless power transmission and communications  

E-Print Network [OSTI]

......................................... 78 39. Geometry of the rectenna element, where the gray-lines are the transmission line networks: d = 4.18 mm, l 1 = 1.46 mm, l 2 = 0.9 mm, l 3 = 10 mm, l 4 = 4.83 mm, l 5 = 4.18 mm, and l 6 = 15.01 mm.................................................................... 79 40. Transmission line networks of the rectenna arrays: (a) 1x2 array and (b) 2x2 array, with l 7 = 8.54 mm, and l 8 = 23.55 mm....................................................... 80 41. 35 GHz rectenna measurement setup diagram...

Ren, Yu-Jiun

2009-05-15T23:59:59.000Z

430

Analysis of results obtained using the automatic chemical control of the quality of the water heat carrier in the drum boiler of the Ivanovo CHP-3 power plant  

Science Journals Connector (OSTI)

Results of industrial tests of the new method used for the automatic chemical control of the quality of boiler water of the drum-type power boiler (P d = 13.8 MPa) are described. The possibility o...

A. B. Larin; A. V. Kolegov

2012-10-01T23:59:59.000Z

431

Automatic control systems for gas-turbine units in mini power stations: Testing automation at the stages of design and tuning  

Science Journals Connector (OSTI)

This paper presents the testing automation procedure for automatic control systems of gas-turbine units used as drives in small-size power stations. We substantiate the applicability of mathematical modeling...

B. V. Kavalerov

2013-11-01T23:59:59.000Z

432

Bulk Power System Dynamics and Control -VII, August 19-24 2007, Charleston, South Carolina, USA Towards Quantifying Cascading Blackout Risk  

E-Print Network [OSTI]

Bulk Power System Dynamics and Control - VII, August 19-24 2007, Charleston, South Carolina, USA Department, University of Wisconsin, Madison, WI 53706 USA Abstract Blackouts become widespread by initial

433

TAS: 89 0227: TAS Recovery Act - Optimization and Control of Electric Power Systems: ARRA  

SciTech Connect (OSTI)

The name SuperOPF is used to refer several projects, problem formulations and soft-ware tools intended to extend, improve and re-define some of the standard methods of optimizing electric power systems. Our work included applying primal-dual interior point methods to standard AC optimal power flow problems of large size, as well as extensions of this problem to include co-optimization of multiple scenarios. The original SuperOPF problem formulation was based on co-optimizing a base scenario along with multiple post-contingency scenarios, where all AC power flow models and constraints are enforced for each, to find optimal energy contracts, endogenously determined locational reserves and appropriate nodal energy prices for a single period optimal power flow problem with uncertainty. This led to example non-linear programming problems on the order of 1 million constraints and half a million variables. The second generation SuperOPF formulation extends this by adding multiple periods and multiple base scenarios per period. It also incorporates additional variables and constraints to model load following reserves, ramping costs, and storage resources. A third generation of the multi-period SuperOPF, adds both integer variables and a receding horizon framework in which the problem type is more challenging (mixed integer), the size is even larger, and it must be solved more frequently, pushing the limits of currently available algorithms and solvers. The consideration of transient stability constraints in optimal power flow (OPF) problems has become increasingly important in modern power systems. Transient stability constrained OPF (TSCOPF) is a nonlinear optimization problem subject to a set of algebraic and differential equations. Solving a TSCOPF problem can be challenging due to (i) the differential-equation constraints in an optimization problem, (ii) the lack of a true analytical expression for transient stability in OPF. To handle the dynamics in TSCOPF, the set of differential equations can be approximated or converted into equivalent algebraic equations before they are included in an OPF formulation. In Chapter 4, a rigorous evaluation of using a predefined and fixed threshold for rotor angles as a mean to determine transient stability of the system is developed. TSCOPF can be modeled as a large-scale nonlinear programming problem including the constraints of differential-algebraic equations (DAE). Solving a TSCOPF problem can be challenging due to (i) the differential-equation constraints in an optimization problem, (ii) the lack of a true analytical expression for transient stability constraint in OPF. Unfortunately, even the current best TSCOPF solvers still suffer from the curse of dimensionality and unacceptable computational time, especially for large-scale power systems with multiple contingencies. In chapter 5, thse issues will be addressed and a new method to incorporate the transient stability constraints will be presented.

Chiang, Hsiao-Dong

2014-02-01T23:59:59.000Z

434

Microgrids in active network managementPart I: Hierarchical control, energy storage, virtual power plants, and market participation  

Science Journals Connector (OSTI)

Abstract The microgrid concept has been closely investigated and implemented by numerous experts worldwide. The first part of this paper describes the principles of microgrid design, considering the operational concepts and requirements arising from participation in active network management. Over the last several years, efforts to standardize microgrids have been made, and it is in terms of these advances that the current paper proposes the application of IEC/ISO 62264 standards to microgrids and Virtual Power Plants, along with a comprehensive review of microgrids, including advanced control techniques, energy storage systems, and market participation in both island and grid-connection operation. Finally, control techniques and the principles of energy-storage systems are summarized in a comprehensive flowchart.

Omid Palizban; Kimmo Kauhaniemi; Josep M. Guerrero

2014-01-01T23:59:59.000Z

435

Bulk Power System Dynamics and Control -VII, August 19-24, 2007, Charleston, South Carolina, USA Dynamics of a Microgrid Supplied by Solid Oxide Fuel Cells1  

E-Print Network [OSTI]

. The results of an example in which two SOFC plants provide power to a microgrid are presented. The simulation1 Bulk Power System Dynamics and Control - VII, August 19-24, 2007, Charleston, South Carolina, USA, but is not concerned with the thermal dynamics. A DC-DC boost converter interfaces the SOFC stack to a DC bus, where

Hiskens, Ian A.

436

An Integrated Scheme for Anomaly Identification and Automatic Control of Nuclear Power Plants Xin Jin, Robert M. Edwards and Asok Ray  

E-Print Network [OSTI]

An Integrated Scheme for Anomaly Identification and Automatic Control of Nuclear Power Plants Xin.edu INTRODUCTION Nuclear Power Plants (NPPs) are complex systems with many variables that require adjustment to the NPP. METHODOLOGY This proposed integrated scheme consists of three inter-related subsystems: Nuclear

Ray, Asok

437

2013 IREP Symposium-Bulk Power System Dynamics and Control -IX (IREP), August 25-30, 2013, Rethymnon, Greece Active network management: planning under  

E-Print Network [OSTI]

]. Such incentives have resulted in the on-going installation of wind and solar power generation resources2013 IREP Symposium-Bulk Power System Dynamics and Control -IX (IREP), August 25-30, 2013 In Europe, concern about the environmental impact of the electricity industry is currently driving

Ernst, Damien

438

Bulk Power System Dynamics and Control VI, August 22-27, 2004, Cortina d'Ampezzo, Italy Voltage Stability Enhancement via Model Predictive  

E-Print Network [OSTI]

Bulk Power System Dynamics and Control VI, August 22-27, 2004, Cortina d'Ampezzo, Italy Voltage of the North American power system in August 2003 could have been avoided by tripping a relatively small amount be more palatable. Recent advances in communications and computer systems facilitate such non-disruptive

Hiskens, Ian A.

439

Systems and methods for providing power to a load based upon a control strategy  

SciTech Connect (OSTI)

Systems and methods are provided for an electrical system. The electrical system, for example, includes a first load, an interface configured to receive a voltage from a voltage source, and a controller configured to receive the voltage through the interface and to provide a voltage and current to the first load. The controller may be further configured to, receive information on a second load electrically connected to the voltage source, determine an amount of reactive current to return to the voltage source such that a current drawn by the electrical system and the second load from the voltage source is substantially real, and provide the determined reactive current to the voltage source.

Perisic, Milun; Lawrence, Christopher P; Ransom, Ray M; Kajouke, Lateef A

2014-11-04T23:59:59.000Z

440

Electronic Power Conversion System for an Advanced Mobile Generator Set Leon M. Tolbert1,3  

E-Print Network [OSTI]

. The military generator set uses an internal combustion diesel engine to drive a radial-gap permanent magnet. The variable frequency, variable voltage produced by the permanent magnet alternator is diode-rectified to dc synchronous machines are presently used to convert the mechanical power of the rotating shaft into three

Tolbert, Leon M.

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

The Power of Friction: Quantifying the ``Goodness'' of Frictional Grasps \\Lambda  

E-Print Network [OSTI]

The Power of Friction: Quantifying the ``Goodness'' of Frictional Grasps \\Lambda Marek Teichmann of fingers, coefficient of friction and the the goodness of a grasp. In particular, we give a general framework for defining a grasp metric that takes friction into account. Our approach rectifies a flaw

Mishra, Bud

442

Synthesis and Validation of Control Software For A Vehicular Electric Power Distribution Testbed  

E-Print Network [OSTI]

protocols on high-fidelity simulation models and on an academic-scale hardware testbed. 1 #12;I- vated by the resulting rapid increase in the costs and duration of the design cycles for such systems, we investigate the use of formal specification and automated, correct-by- construction control

Xu, Huan

443

Advanced control for power density maximization of the brushless DC generator  

E-Print Network [OSTI]

-to line EMF............................... 129 96 Original phase EMF and current reference waveform................................... 130 97 Original phase EMF, current reference waveform, and controlled current... 130 98 Impact of the current... ................. 6 A. Mechanical structure of the BLDC generator .............................. 7 B. Permanent magnets of the BLDC generator................................. 10 C. Induced EMF of the BLDC generator...

Lee, Hyung-Woo

2005-02-17T23:59:59.000Z

444

On The Impact of Communication Delays on Power System Automatic Generation Control Performance  

E-Print Network [OSTI]

and physical components that, under visions such as the US Department of Energy Smart Grid [1], are likely of the smart grid vision. Supervisory control and data acquisition (SCADA) systems, as computer an impact on system metrics, e.g., frequency deviations from its nominal value. The AGC system takes

Liberzon, Daniel

445

Nonlinear Adaptive Control of Networked Power Generators with Remote Measurement Units  

E-Print Network [OSTI]

provided by Phasor Measurement Units (PMU). The proposed control system is designed in a robust way illustrate its good behavior, and suggest that the new measurement and data transmission devices can bring Measurement Units (PMU). These devices are far beyond SCADA, and let one envisage the use of real time remote

Paris-Sud XI, Université de

446

On the Failure of Power System Automatic Generation Control due to Measurement Noise  

E-Print Network [OSTI]

of the Supervisory Control and Data Acquisition (SCADA) system that resides in a centralized location (typically of service attacks, and resort to other malicious actions [2]. Various false data detection techniques based PMU measurements by spoofing the clocks that they use for synchronization [7]. Apart from malicious

Liberzon, Daniel

447

Modelling of power plant dynamics and uncertainties for robust control synthesis *  

E-Print Network [OSTI]

such as the aeroelasticity of gas turbine blades. As a relatively less accurate (and less computation intensive) alternative on the fundamental laws of physics and lumped-parameter approximation, a nonlinear time-invariant model is developed control, structured singular value synthesis 1. Introduction With recent advances in computer technology

Ray, Asok

448

CHANCE CONSTRAINED OPTIMAL POWER FLOW: RISK-AWARE NETWORK CONTROL UNDER UNCERTAINTY  

E-Print Network [OSTI]

in the grid are largely of an engineering nature (i.e. the flywheel-directed generator response used to handle generation (coal, gas and hy- dro plants) over control areas of transmission networks, can result in grid awareness of major uncertainty, in particular fluctuations in renewable output. As a result, grid operation

Bienstock, Daniel

449

The development of control strategy for solid oxide fuel cell and micro gas turbine hybrid power system in ship application  

Science Journals Connector (OSTI)

A solid oxide fuel cell (SOFC) and micro gas turbine (MGT) hybrid power system is a newly developed and promising power technology for ship power systems. Compared to conventional power plants on commercial sh...

Jiqing He; Peilin Zhou; David Clelland

2014-12-01T23:59:59.000Z

450

Electrical power systems (Panama). Energy generation and control equipment, July 1991. Export trade information  

SciTech Connect (OSTI)

Concerning energy generation equipment, the Panamanian market is supplied entirely by imports, mainly from the United States, the United Kingdom, Japan and Korea. The market is heavily dependent on government purchases, mainly generators and transformers. Imports showed a promising growth of 17% during 1990. Most energy generation and control equipment products are imported as local manufacturing is non existent, with the exception of copper cables.

Not Available

1991-07-01T23:59:59.000Z

451

Compensated gain control circuit for buck regulator command charge circuit  

DOE Patents [OSTI]

A buck regulator command charge circuit includes a compensated-gain control signal for compensating for changes in the component values in order to achieve optimal voltage regulation. The compensated-gain control circuit includes an automatic-gain control circuit for generating a variable-gain control signal. The automatic-gain control circuit is formed of a precision rectifier circuit, a filter network, an error amplifier, and an integrator circuit.

Barrett, David M. (Albuquerque, NM)

1996-01-01T23:59:59.000Z

452

Compensated gain control circuit for buck regulator command charge circuit  

DOE Patents [OSTI]

A buck regulator command charge circuit includes a compensated-gain control signal for compensating for changes in the component values in order to achieve optimal voltage regulation. The compensated-gain control circuit includes an automatic-gain control circuit for generating a variable-gain control signal. The automatic-gain control circuit is formed of a precision rectifier circuit, a filter network, an error amplifier, and an integrator circuit. 5 figs.

Barrett, D.M.

1996-11-05T23:59:59.000Z

453

A Simple Algorithm for Closed-Loop Control of Stepping Motors IEE Proc. -Electr. Power Appl., (1995) Vol 142, No 1, pp 5-13.  

E-Print Network [OSTI]

A Simple Algorithm for Closed-Loop Control of Stepping Motors IEE Proc. - Electr. Power Appl of Reading Whiteknights PO Box 225 Reading RG6 2AY ABSTRACT Stepping motors are normally operated without feedback. A simple control algorithm is developed which allows a stepping motor to operate effectively

Grimbleby, James

454

Bulk Power System Dynamics and Control IV -Restructuring, August 24-28, Santorini, Greece. Improving Pacific Inter-tie Stability Using  

E-Print Network [OSTI]

, and C) Slatt TCSC (on the Slatt-Buckley 500 kV line); and 2) to design robust controls@eecs.wsu.edu Transmission Operations and Planning Bonneville Power Administration Vancouver, WA 98666-0491 Abstract voltage control needs for the stability support of COI lines in the Pacific Northwest system. The proposed

Venkatasubramanian, Mani V.

455

An Integrated Rectifier/Regulator for a Wireless Battery Charging System.  

E-Print Network [OSTI]

?? A wirelessly powered charging system for use in implanted biomedical applications is proposed. A sinusoidal ac voltage received through the magnetic inductive link, which (more)

Lin, Feng-Hsu

2009-01-01T23:59:59.000Z

456

Wideband Reflectarray Using Compact Coupled Element and Rectifying Antenna Combined with Reflectarray  

E-Print Network [OSTI]

the Archimedean spiral antenna over the bandwidth. The research presented in this dissertation suggests useful techniques for wideband reflectarrays, wireless power transmission, and wideband antenna designs....

Oh, Seong Won

2012-10-19T23:59:59.000Z

457

Qualification issues associated with the use of advanced instrumentation and control systems hardware in nuclear power plants  

SciTech Connect (OSTI)

The instrumentation and control (I&C) systems in advanced reactors will make extensive use of digital controls, microprocessors, multiplexing, and Tiber-optic transmission. Elements of these advances in I&C have been implemented on some current operating plants. However, the widespread use of the above technologies, as well as the use of artificial intelligence with minimum reliance on human operator control of reactors, highlights the need to develop standards for qualifying I&C used in the next generation of nuclear power plants. As a first step in this direction, the protection system I&C for present-day plants was compared to that proposed for advanced light water reactors (ALWRs). An evaluation template was developed by assembling a configuration of a safety channel instrument string for a generic ALWR, then comparing the impact of environmental stressors on that string to their effect on an equivalent instrument string from an existing light water reactor. The template was then used to address reliability issues for microprocessor-based protection systems. Standards (or lack thereof) for the qualification of microprocessor-based safety I&C systems were also identified. This approach addresses in part issues raised in Nuclear Regulatory Commission policy document SECY-91-292. which recognizes that advanced I&C systems for the nuclear industry are ``being developed without consensus standards, as the technology available for design is ahead of the technology that is well understood through experience and supported by application standards.``

Korsah, K. [Oak Ridge National Lab., TN (United States); Antonescu, C. [Nuclear Regulatory Commission, Rockville, MD (United States). Office of Nuclear Regulatory Research

1993-10-01T23:59:59.000Z

458

A PC-PCL-based control system for the high-voltage pulsed-power operation of the Intense Diagnostic Neutral Beam (IDNB) Experiment  

SciTech Connect (OSTI)

A stand-alone, semiautomated control system for the high-voltage pulsed-power energy sources on the Intense Diagnostic Neutral Beam Experiment at Los Alamos National Laboratory using personal computer (PC) and programmable logic controller (PLC) technology has been developed and implemented. The control system, consisting of a PC with the graphic operator interface, the network connecting the PC to the PLC, the PLC, the PLC I/O modules, fiber-optic interfaces and software, is described.

Gribble, R.

1993-06-01T23:59:59.000Z

459

Zebra Mussel control experiences at Detroit Edison Harbor Beach Power Plant  

SciTech Connect (OSTI)

The Detroit Edison Co. Harbor Beach Power Plant on Lake Huron in Michigan`s thumb and is comprised of one 100 MW coal-fired unit. Zebra mussels first were discovered during a routine inspection of the plant screen house in August 1991. The initial population of 5 mussels/m{sup 2} increased to 650 mussels/m{sup 2} by March 1992. During this eight-month period the plant began to experience problems with zebra mussels clogging small coolers, check valves, and miscellaneous service water connections. Although the mussels had not affected the unit`s availability, it was evident that they soon might if left uncontrolled. A treatment program was devised in 1992 to eliminate the mussels living in the screen house and inside the plant. Targeted in-plant systems included the condenser cooling supply lines, plant service water system, and plant fire fighting system. An oxygen scavenger (sodium sulfate) was used in conjunction with thermal treatment (saturated steam) to asphyxiate and heat the mussels over a several day period. Inspection dives in the screen house before and after treatment as well as subsequent in-plant equipment inspections have revealed the treatment to be successful. Complete mortality was achieved in the screen house and in-plant systems. By April, 1993, the zebra mussel colony had re-established itself in the plant screen house to a level of 400 mussels/m{sup 2}. In October 1993, the colony had grown to 2,600 mussels/m{sup 2}. A second treatment was scheduled and completed on October 18--21, 1993. Thermal treatment was used alone during this treatment episode in which 100% mortality again wax achieved. Test bags, an in-line viewport, and post treatment dive inspections confirmed that the treatment was completely successful. Population monitoring and treatments continue on a regular basis.

Harwood, D.B.; Buda, D.J. [Detroit Edison Co., Harbor Beach, MI (United States)

1994-12-31T23:59:59.000Z

460

Electric Power Research Institute: Environmental Control Technology Center. Report to the Steering Committee, February 1996. Final technical report  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute`s Environmental Control Technology Center. Testing on the 4.0 MW Pilot Wet FGD unit continued this month with the Carbon Injection System and the Trace Element Removal test blocks. With this testing, the mercury measurement (Method 29) studies also continued with impinger capture solutions. The 4.0 MW Spray Dryer Absorber System (Carbon Injection System) was utilized in the TER test configuration this month. The B&W/CHX Heat Exchanger unit is being installed utilizing the Mini Pilot Flue Gas System. The 1.0 MW Cold- Side Selective Catalytic Reduction (SCR) unit remained idle this month in a cold-standby mode. Monthly inspections were conducted for all equipment in cold-standby, as well as for the fire safety systems, and will continue to be conducted by the ECTC Operations and Maintenance staff.

NONE

1996-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Optimal Power Schedule for Distributed MIMO Links  

E-Print Network [OSTI]

an integration of link scheduling and power control for MIMOmedium access control, space-time power scheduling. Fig. 1.

Rong, Yue; Hua, Yingbo

2008-01-01T23:59:59.000Z

462

Novel Dual-Functional Membrane for Controlling Carbon Dioxide Emissions from Fossil Fuel Power Plants  

SciTech Connect (OSTI)

CO{sub 2} captured from coal-fired power plants represents three-quarters of the total cost of an entire carbon sequestration process. Conventional amine absorption or cryogenic separation requires high capital investment and is very energy intensive. Our novel membrane process is energy efficient with great potential for economical CO{sub 2} capture. Three classes of microporous sol-gel derived silica-based membranes were developed for selective CO{sub 2} removal under simulated flue gas conditions (SFG), e.g. feed of 10% vol. CO{sub 22} in N{sub 2}, 1 atm total pressure, T = 50-60 C, RH>50%, SO2>10 ppm. A novel class of amine-functional microporous silica membranes was prepared using an amine-derivatized alkoxysilane precursor, exhibiting enhanced (>70) CO{sub 2}:N{sub 2} selectivity in the presence of H{sub 2}O vapor, but its CO{sub 2} permeance was lagging (<1 MPU). Pure siliceous membranes showed higher CO{sub 2} permeance (1.5-2 MPU) but subsequent densification occurred under prolonged SFG conditions. We incorporated NiO in the microporous network up to a loading of Ni:Si = 0.2 to retard densification and achieved CO2 permeance of 0.5 MPU and CO{sub 2}:N{sub 2} selectivity of 50 after 163 h exposure to SFG conditions. However, CO{sub 2} permeance should reach greater than 2.0 MPU in order to achieve the cost of electricity (COE) goal set by DOE. We introduced the atomic layer deposition (ALD), a molecular deposition technique that substantially reduces membrane thickness with intent to improve permeance and selectivity. The deposition technique also allows the incorporation of Ni or Ag cations by proper selection of metallorganic precursors. In addition, preliminary economic analysis provides a sensitivity study on the performance and cost of the proposed membranes for CO{sub 2} capture. Significant progress has been made toward the practical applications for CO{sub 2} capture. (1 MPU = 1.0 cm{sup 3}(STP){center_dot}cm-2{center_dot}min-1{center_dot}atm-1)

C. Brinker; George Xomeritakis; C.-Y. Tsai; Ying-Bing Jiang

2009-04-30T23:59:59.000Z

463

Electric Power Research Institute: Environmental Technology Control Center, report to the Steering committee. Final technical report  

SciTech Connect (OSTI)

This report describes test for air pollution control of flue gas and mercury as a result of coal combustion. The NYSEG Kintigh Station provided flue gas to the Center 100% of the time during this performance period. As the Kintigh Station operated with a variety of coals, fluctuations in the Center`s inlet SO{sub 2} concentrations were experienced. Safety training for the month was conducted by the O&M Superintendent, Maintenance Supervisor and Shift Supervisors. {open_quotes}Personal Protective Equipment{close_quotes} was the topic of the month. Inspections of the ECTC Facility and safety equipment (SCR air-packs, fire extinguishers, etc.) were completed and recorded this month. All systems were found to be in good condition. By continuing to emphasize safe work habits at the Center, we have raised the total number of days without a lost time injury to 1426 as of 4/30/96. The monthly safety meeting with the NYSEG Kintigh Station was held on April 30, 1996 with both NYSEG and ECTC representatives. The topics of discussion included an overview of NYSEG`s upcoming alternate fuel burn, an update on plant staffing changes, and a discussion of future safety training activities.

NONE

1996-04-01T23:59:59.000Z

464

Interferometric adaptive optics for high power laser pointing, wave-front control and phasing  

SciTech Connect (OSTI)

Implementing the capability to perform fast ignition experiments, as well as, radiography experiments on the National Ignition Facility (NIF) places stringent requirements on the control of each of the beam's pointing and overall wavefront quality. One quad of the NIF beams, 4 beam pairs, will be utilized for these experiments and hydrodynamic and particle-in-cell simulations indicate that for the fast ignition experiments, these beams will be required to deliver 50% (4.0 kJ) of their total energy (7.96 kJ) within a 40 {micro}m diameter spot at the end of a fast ignition cone target. This requirement implies a stringent pointing and overall phase conjugation error budget on the adaptive optics system used to correct these beam lines. The overall encircled energy requirement is more readily met by phasing of the beams in pairs but still requires high Strehl ratios, Sr, and rms tip/tilt errors of approximately one {micro}rad. To accomplish this task we have designed an interferometric adaptive optics system capable of beam pointing, high Strehl ratio and beam phasing with a single pixilated MEMS deformable mirror and interferometric wave-front sensor. We present the design of a testbed used to evaluate the performance of this wave-front sensor below along with simulations of its expected performance level.

Baker, K L; Stappaerts, E A; Homoelle, D C; Henesian, M A; Bliss, E S; Siders, C W; Barty, C J

2009-01-21T23:59:59.000Z

465

Targeted chlorination for biofouling control in steam electric power plant condenser tubes  

SciTech Connect (OSTI)

The objective of this study was to develop an understanding of the relationships between biofouling, heat transfer, and to assess the technical feasibility of the targeted chlorination (TC) concept as an alternative to conventional chlorination in once-through seawater cooling systems. A shell and tube type heat exchanger was designed and constructed. The test facility monitored biofouling growth by measuring heat transfer resistance (thermal performance), pressure drop (hydraulic performance), and biomass deposit. Biocide effectiveness was determined by triplicates average residual biomass. Tests were run to evaluate 18 treatment scenarios. Preliminary tests were done to determine variabilities between shells and among tubes, effect of heating, very high dose chlorine burn out and regrowth behavior. LOGIT, a software package by the National Bureau of Standards (NBS) for sigmoidal fit, was used for the preliminary test data. The other three tests studied effect of chlorine dosage (low, high), contact time, and frequency. To minimize variability in results, triplicates for each chlorination scheme were used. The total amount of chlorine applied (flow rate Q x C x T x F) ranged from about 400 to 4,000 pounds per million gallons per day (an equivalent to a CTF range of 6 to 60 ppm.min/day). With respect to efficiency of biofouling control, it was found by regression analysis that among four variables C, T, (CT) and F, F was most significant and C, T, and (CT) were relatively equal in ranking.

Tewari, R.N.

1991-01-01T23:59:59.000Z

466

Single-Phase Inverter and Rectifier for High-Reliability Applications  

E-Print Network [OSTI]

and governments worldwide. In addition to finding these energy resources, new technologies are being sought to improve the efficiency of consuming the generated energy. Power Electronics is the key technology for both generation and the efficient consumption...

Harb, Souhib

2014-05-01T23:59:59.000Z

467

EEE472-FA09-PE August 28, 2012 Page 1 of 2 EEE 472 Power Electronics (3)  

E-Print Network [OSTI]

frequency isolation 6. PWM voltage source inverters and rectifiers 7. Grid interface of renewable resources of homework assignments or a mini-project the students need to consider a power conversion application engineering problems in homework as well as in the mini-project. Person(s) preparing this description and date

Zhang, Junshan

468

A fuzzy logic supervisor for active and reactive power control of a variable speed wind energy conversion system associated to a flywheel storage system  

Science Journals Connector (OSTI)

In this paper, we propose a Wind Energy Conversion System (WECS) at variable speed using a Doubly Fed Induction Generator (DFIG) controlled on the rotor side through converters. A Flywheel Energy Storage System (FESS) is connected to the studied wind generator at the DC bus in order to evaluate its capacity to participate to the ancillary services. We study the improvement of the active and reactive power quality produced by the wind generator and its effect on the load voltage regulation connected to the wind generator. For that, a fuzzy logic supervisor is established to control the FESS operation and the DC bus voltage in order to smooth the active power fluctuations due to the random wind speed variations. A control law is also described to smooth the reactive power at the connection node to the grid.

Lilia Jerbi; Lotfi Krichen; Abderrazak Ouali

2009-01-01T23:59:59.000Z

469

PowerPoint Presentation  

Office of Environmental Management (EM)

Power Generation & Distribution-Technologies that generate on-site power or manage energy markets (e.g. PV, microgrid control systems) What are We Looking for?...

470

Extending the Constant Power Speed Range of the Brushless DC Motor through Dual Mode Inverter Control -- Part I: Theory and Simulation  

SciTech Connect (OSTI)

An inverter topology and control scheme has been developed that can drive low-inductance, surface-mounted permanent magnet motors over the wide constant power speed range required in electric vehicle applications. This new controller is called the dual-mode inverter control (DMIC) [1]. The DMIC can drive either the Permanent Magnet Synchronous Machine (PMSM) with sinusoidal back emf, or the brushless dc machine (BDCM) with trapezoidal emf in the motoring and regenerative braking modes. In this paper we concentrate on the BDCM under high-speed motoring conditions. Simulation results show that if all motor and inverter loss mechanisms are neglected, the constant power speed range of the DMIC is infinite. The simulation results are supported by closed form expressions for peak and rms motor current and average power derived from analytical solution to the differential equations governing the DMIC/BDCM drive for the lossless case. The analytical solution shows that the range of motor inductance that can be accommodated by the DMIC is more than an order of magnitude such that the DMIC is compatible with both low- and high-inductance BDCMs. Finally, method is given for integrating the classical hysteresis band current control, used for motor control below base speed, with the phase advance of DMIC that is applied above base speed. The power versus speed performance of the DMIC is then simulated across the entire speed range.

Lawler, J.S.

2001-10-29T23:59:59.000Z

471

Reliability Analysis for the Advanced Electric Power Grid: From Cyber Control and Communication to Physical Manifestations of Failure  

Science Journals Connector (OSTI)

The advanced electric power grid is a cyber-physical system comprised of ... of the device and the reliability of the power grid on which they are deployed. The IEEE118...

Ayman Z. Faza; Sahra Sedigh

2009-01-01T23:59:59.000Z

472

Control of Power Networks  

Science Journals Connector (OSTI)

... the engineer is at once informed of the state of the load at a distribution substation, and the methods by means of which the apparatus is started and circuits opened ...

1936-03-21T23:59:59.000Z

473

Electric Power Research Institute: Environmental Control Technology Center report to the Steering Committee. Final technical monthly report  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute`s Environmental Control Technology Center. Testing on the 4.0 MW Pilot Wet FGD unit continued this month with the Trace Element Removal (TER) test block as the Pilot was operated at baseline, forced oxidation, and inhibited oxidation conditions. As the NYSEG Kintigh Station conducted a test bum this month with Petroleum coke/coal fuel blends, a one-week trace element characterization test was performed across the Pilot unit testing this flue gas. Additionally, the mercury measurement (Method 29) studies continued this month as investigations into various activated carbons, metal amalgams, and impinger capture solutions were conducted. As a result of new directions received from EPRI, August was the last scheduled month for testing on the 1.0 MW Cold-Side Selective Catalytic Reduction (SCR) unit at the ECTC. This month, the unit was isolated from the flue gas path and placed in a cold-standby mode for future test activities.

NONE

1995-09-01T23:59:59.000Z

474

Is Selective Catalytic Reduction (SCR) an attractive option for NO{sub x} control in coal-fired power plants?  

SciTech Connect (OSTI)

Economics have been estimated for Selective Catalytic Reduction (SCR) for NO{sub x} control on power plant boilers burning high sulfur bituminous coals. Costs are based on an SCR unit installed in the hot flue gas on the high-dust side of a 500 MW greenfield plant with a capacity factor of 65%. Uncontrolled NO{sub x} emissions are 1.0 lb/10{sup 6} Btu, with 80% removal of the inlet NO{sub x}. At a space velocity of 2,500/hr and a catalyst price of $370/ft{sup 3}, the total capital requirement is $55/kW. Recent improvements indicate that space velocity can be increased by about 30%, to about 3250/hr. Incorporating this value reduces total capital to about $50/kW. With a 4-year catalyst life, the levelized cost (on a current dollar basis) is 3.4 mills/kWh,m or $870/ton of NO{sub x} removed.

Baldwin, A.L.; Smith, D.N. [Department of Energy, Pittsburgh, PA (United States). Pittsburgh Energy Technology Center; Mann, A.N.; McIlvried, H.G.; Rao, S.N. [Burns and Roe Services Corp., Pittsburgh, PA (United States)

1995-12-31T23:59:59.000Z

475

U.S. Seafood Safe and Unaffected by Radiation Contamination from Japanese Nuclear Power Plant Incident; U.S. Monitoring Control Strategy Explained  

E-Print Network [OSTI]

U.S. Seafood Safe and Unaffected by Radiation Contamination from Japanese Nuclear Power Plant (NOAA) have high confidence in the safety of seafood products in the U.S. marketplace or exported U.S. seafood products. The U.S. government's measures to monitor and control the three

476

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 23, NO. 2, JUNE 2008 551 Sliding Mode Power Control of Variable-Speed Wind  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 23, NO. 2, JUNE 2008 551 Sliding Mode Power Control of Variable-Speed Wind Energy Conversion Systems Brice Beltran, Tarek Ahmed-Ali, and Mohamed El Hachemi in variable-speed wind energy conversion sys- tems (VS-WECS). These systems have two operation regions de

Paris-Sud XI, Université de

477

2007 iREP Symposium-Bulk Power System Dynamics and Control -VII, Revitalizing Operational Reliability August 19-24, 2007, Charleston, SC, USA  

E-Print Network [OSTI]

2007 iREP Symposium- Bulk Power System Dynamics and Control - VII, Revitalizing Operational and system operations, the multiple markets and the participation of financial players make the operational the system and market operations is well understood on a qualitative basis, the quantification

Gross, George

478

2428 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 23, NO. 5, SEPTEMBER 2008 A Modular Strategy for Control and Voltage  

E-Print Network [OSTI]

, voltage balancing. I. INTRODUCTION WITH THE advancement of power electronics and emer- gence of new.1109/TPEL.2008.2002055 The CHB converters can be used as inverters in ac motor drives, high power2428 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 23, NO. 5, SEPTEMBER 2008 A Modular Strategy

Paris-Sud XI, Université de

479

Dynamic Performance and Control of a Multilevel Universal Power Conditioner Leon M. Tolbert, Fang Z. Peng Thomas G. Habetler  

E-Print Network [OSTI]

-to-back diode-clamped inverters that constitute the universal power conditioner. An experimental verification. To meet the objectives detailed in these new premium power agreements, the implementation of advanced- clamped inverter into a universal power conditioner is an enticing prospect. For a multilevel universal

Tolbert, Leon M.

480

Power and spectrum efficient communications in wireless ad hoc networks  

E-Print Network [OSTI]

Ephremides, Joint Scheduling and Power Control for WirelessOptimal Power Control, Scheduling, and Routing in UWBDistributed Joint Scheduling and Power Control Algorithm for

Qu, Qi

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Utilization of Lignite Reserves and Simultaneous Improvement of Dust Emissions and Operation Efficiency of a Power Plant by Controlling the Calcium (Total and Free) Content of the Fed Lignite. Application on the Agios Dimitrios Power Plant, Ptolemais, Greece  

Science Journals Connector (OSTI)

Utilization of Lignite Reserves and Simultaneous Improvement of Dust Emissions and Operation Efficiency of a Power Plant by Controlling the Calcium (Total and Free) Content of the Fed Lignite. ... Using the technique mentioned above, by determining the lignite recoverable blocks and progressively improving the mixing of the lignites with different qualities, the solid particle emissions were generally stabilized and reduced (lower than 150 mg m-3), with the best improvement observed around April 1999 and afterward (Figures 2?5). ...

Nestoras Kolovos; Andreas Georgakopoulos; Anestis Filippidis; Constantinos Kavouridis

2002-09-11T23:59:59.000Z

482

Energy Harvesting for Self-Powered Wireless Sensors  

E-Print Network [OSTI]

. . . . . . . . . . . . . . . . . . . . 37 D. CMOS Rectifiers . . . . . . . . . . . . . . . . . . . . . . . 39 1. Standard and Schottky Diode Rectifiers . . . . . . . . 39 2. MOS Diode Rectifiers . . . . . . . . . . . . . . . . . . 41 3. Efficiency Enhancement Techniques.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 9 Extrapolated MSMA output voltage vs. frequency. . . . . . . . . . . 29 10 Greinacher/Cockroft-Walton N-stage inductorless transformer. . . . . 35 11 Different rectifier architectures with: a) diodes, b) NMOS, c) CMOS, d) EVC, e) IVC, f) SVC...

Wardlaw, Jason

2012-02-14T23:59:59.000Z

483

Maximizing Power Output in Homogeneous Charge Compression Ignition (HCCI) Engines and Enabling Effective Control of Combustion Timing  

E-Print Network [OSTI]

Ford Motor Company, Diesel Engine Aftertreatment: How FordNational Laboratory, Engine Combustion Network, http://High Power Output without Engine Knock and with Ultra-Low

Saxena, Samveg

2011-01-01T23:59:59.000Z

484

Maximizing Power Output in Homogeneous Charge Compression Ignition (HCCI) Engines and Enabling Effective Control of Combustion Timing  

E-Print Network [OSTI]

Experimental study of biogas combustion characteristics andthe operation range of a biogas HCCI engine for powerOperating Conditions in a Biogas Fueled HCCI Engine for

Saxena, Samveg

2011-01-01T23:59:59.000Z

485

Maximizing Power Output in Homogeneous Charge Compression Ignition (HCCI) Engines and Enabling Effective Control of Combustion Timing  

E-Print Network [OSTI]

heat loss, while excessively delayed combustion timing (before misfire) can cause power output and efficiency losses because of incomplete oxidation of hydrocarbons

Saxena, Samveg

2011-01-01T23:59:59.000Z

486

Power system security enhancement through effective allocation, control and integration of demand response program and FACTS devices.  

E-Print Network [OSTI]

??This thesis is devoted to the development of a new approach for using the FACTS devices and demand response programs to improve the power system (more)

Yousefi, Ashkan

2013-01-01T23:59:59.000Z

487

520 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 16, NO. 3, AUGUST 2001 Analysis of Load Frequency Control Performance  

E-Print Network [OSTI]

Control Performance Assessment Criteria George Gross, Fellow, IEEE and Jeong Woo Lee Abstract--This paper

Gross, George

488

International Atomic Energy Agency specialists meeting on experience in ageing, maintenance, and modernization of instrumentation and control systems for improving nuclear power plant availability  

SciTech Connect (OSTI)

This report presents the proceedings of the Specialist`s Meeting on Experience in Aging, Maintenance and Modernization of Instrumentation and Control Systems for Improving Nuclear Power Plant Availability that was held at the Ramada Inn in Rockville, Maryland on May 5--7, 1993. The Meeting was presented in cooperation with the Electric Power Research Institute, Oak Ridge National Laboratory and the International Atomic Energy Agency. There were approximately 65 participants from 13 countries at the Meeting. Individual reports have been cataloged separately.

Not Available

1993-10-01T23:59:59.000Z

489

Main Canal, Maverick County Water Control and Improvement District above Central Power and Light hydro-electric plant, at Maverick and Kinney Counties, Texas  

E-Print Network [OSTI]

BAIN CANAL NA~ICK COUNTY WATW CONTROL AND INPROllZXBZ DISTRICT ABOVE C~ POWER AND LION HYDRO ELECTRIC PLANT& AT, SIAVERICK AND KINNEY COUNT'S, T~~S By John J. Ledbetter, Jr. Approved as to style and content by: (Che man Committee Heed of pa... Hydro Plant K'KWFS Determfnatfans vcfth Power Canal Current Later Lbiasuremsnts Made by Various Hydrographsrs Using Rated Current Meters Tabulation Shaming f&7CID Irrigated and Irrigable Areas. Tabulation Shawing Average IIumber of' Acres Irrigated...

Ledbetter, John J

2012-06-07T23:59:59.000Z

490

A fuzzy self-tuning PI controller for HVDC links  

SciTech Connect (OSTI)

This paper introduces a fuzzy logic-based tuning of the controller parameters for the rectifier side current regulator and inverter side gamma controller in a high voltage direct current (HVDC) system. A typical point-to-point system has been taken with the detailed representation of converters, transmission links transformers, and filters. The current error and its derivative and the gamma error and its derivative are used as the principal signals to adjust the proportional and integral gains of the rectifier pole controller and the inverter gamma controller, respectively, for the optimum system performance under various normal and abnormal conditions. Finally, a comparative study has been performed with and without tuning, to prove the superiority of the proposed scheme.

Routray, A. [REC, Rourkela (India). Dept. of Electrical Engineering] [REC, Rourkela (India). Dept. of Electrical Engineering; Dash, P.K.; Panda, S.K. [National Univ. of Singapore (Singapore). Dept. of Electrical Engineering] [National Univ. of Singapore (Singapore). Dept. of Electrical Engineering

1996-09-01T23:59:59.000Z

491

Abstract--This paper proposes an optimization based method of planning reactive power control for electric transmission  

E-Print Network [OSTI]

Research under the Electric Power Networks Efficiency and Security (EPNES) program, award ECS0323734. H for electric transmission systems to endow them with the capability of being reconfigured to a secure. The modified New England 39-bus system and a North American power system with 6358 buses are adopted

Kumar, Ratnesh

492

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 23, NO. 5, SEPTEMBER 2008 2353 Discrete-Time Ripple Correlation Control for  

E-Print Network [OSTI]

to a cost function optimum . Zero-average ripple on . Small-signal capacitance of photovoltaic (PV) panel to photovoltaic maximum power point tracking. This paper extends the previous analog technique to the digital to the photovoltaic maximum power point tracking problem. Experimental results verify tracking accuracy greater than

Kimball, Jonathan W.

493

Two-Phase Cooling Method Using R134a Refrigerant to Cool Power Electronic Devices  

SciTech Connect (OSTI)

This paper presents a two-phase cooling method using R134a refrigerant to dissipate the heat energy (loss) generated by power electronics (PE) such as those associated with rectifiers, converters, and inverters for a specific application in hybrid-electric vehicles (HEVs). The cooling method involves submerging PE devices in an R134a bath, which limits the junction temperature of PE devices while conserving weight and volume of the heat sink without sacrificing equipment reliability. First, experimental tests that included an extended soak for more than 300 days were performed on a submerged IGBT and gate-controller card to study dielectric characteristics, deterioration effects, and heat flux capability of R134a. Results from these tests illustrate that R134a has high dielectric characteristics, no deterioration on electrical components, and a heat flux of 114 W/cm 2 for the experimental configuration. Second, experimental tests that included simultaneous operation with a mock automotive air-conditioner (A/C) system were performed on the same IGBT and gate controller card. Data extrapolation from these tests determined that a typical automotive A/C system has more than sufficient cooling capacity to cool a typical 30 kW traction inverter. Last, a discussion and simulation of active cooling of the IGBT junction layer with R134a refrigerant is given. This technique will drastically increase the forward current ratings and reliability of the PE device

Lowe, Kirk T [ORNL; Tolbert, Leon M [ORNL; Ayers, Curtis William [ORNL; Ozpineci, Burak [ORNL; Campbell, Jeremy B [ORNL

2007-01-01T23:59:59.000Z

494

Control of SO{sub 2} and NOx emissions from fossil fuel-fired power plants: Research and practice of TPRI  

SciTech Connect (OSTI)

The generation of electric power in China has been dominated by coal for many years. By the end of 1990, total installed generating capacity reached 135 GW, of which fossil fuel-fired plants accounted for 74 percent. The total electricity generated reached 615 TWh, with fossil fuels accounting for 80.5 percent. About 276 million tons of raw coal are consumed in these fossil fuel-burning units per year, accounting for about 25 percent of the total output of the country. According to the government, by the year 2000, the total installed capacity of Chinese power systems should be at least 240 GW, of which fossil fuels will account for about 77 percent. The coal required for power generation will increase to about 530 million tons per year, accounting for about 38 percent of the total coal output. So, it is obvious that coal consumed in coal-fired power plants occupies a very important place in the national fuel balance. The current environmental protection standards, which are based on ground-level concentrations of pollutants, do not effectively lead to the control of pollution emission concentrations or total SO{sub 2} emissions. Due to the practical limitations of the Chinese economy, there is a limited capability to introduce advanced sulfur emission control technologies. Thus, except for the two 360 MW units imported from Japan for the Luohuang Power Plant in Shichuan province, all the other fossil fuel-fired units have not yet adopted any kind of SO{sub 2} removal measures. The Luohuang units are equipped with Mitsubishi limestone flue gas desulfurization systems. Because of the lack of effective pollution control technologies, large areas of the country have been seriously polluted by SO{sub 2}, and some of them even by acid rain.

Ming-Chuan Zhang

1993-12-31T23:59:59.000Z

495

Building sustainable energy systems: Homeostatic control of grid-connected microgrids, as a means to reconcile power supply and energy demand response management  

Science Journals Connector (OSTI)

Abstract The issue of worldwide over consumption and squandering of electrical energy has resulted in what one might call an energy obesity problem in terms of energy intake and its expenditure. It is indeed something that must change if modern society is to become sustainable someday. This is to be realized in conjunction with adequate government policies and innovative strategies aimed at effectively integrating non-conventional renewable energies (NCRE), with thriftiness and energy efficiency (EE) the three pillars of energy sustainability (ES) in today?s electric power systems generation and distribution infrastructure. This ought to be done in a way that incorporates them jointly, as part of a comprehensive energy strategy to propitiate a wider penetration of distributed generation (DG) solutions. Departing from mainstream literature on the subject, this paper proposes such strategies for integrating hybrid micro-generation power systems to the grid through homeostatic control (HC), as a means to reconcile power supply and energy demand response management (EDRM). These strategies can be designed and implemented in the microgrid?s supervisory control system for the purpose of eliciting EE and thriftiness in consumers to build ES in the system. The theoretical model behind the HC strategies is presented and a numerical example is provided, using real electricity consumption data of a small rural community in Chile. Upon examining a particular set of criteria designed to control renewable power (RP) supply from a grid-tie microgrid to residential consumers, simulation results show that the model proves effective when testing such criteria for different power supply scenarios. Particularly revealing is the role of the energy storage system (ESS) the energy buffer in the HC strategies being proposed and the difference that it makes in eliciting thrifty, efficient energy consumption as a result of individual and collective efforts to ensure energy sustainability of the system as a whole.

Franco Fernando Yanine; Federico I. Caballero; Enzo E. Sauma; Felisa M. Crdova

2014-01-01T23:59:59.000Z

496

Electrical system for pulse-width modulated control of a power inverter using phase-shifted carrier signals and related operating methods  

DOE Patents [OSTI]

Systems and methods are provided for pulse-width modulated control of power inverter using phase-shifted carrier signals. An electrical system comprises an energy source and a motor. The motor has a first set of windings and a second set of windings, which are electrically isolated from each other. An inverter module is coupled between the energy source and the motor and comprises a first set of phase legs coupled to the first set of windings and a second set of phase legs coupled to the second set of windings. A controller is coupled to the inverter module and is configured to achieve a desired power flow between the energy source and the motor by modulating the first set of phase legs using a first carrier signal and modulating the second set of phase legs using a second carrier signal. The second carrier signal is phase-shifted relative to the first carrier signal.

Welchko, Brian A. (Torrance, CA)

2012-02-14T23:59:59.000Z

497

Digital Full-Scope Simulation of a Conventional Nuclear Power Plant Control Room, Phase 2: Installation of a Reconfigurable Simulator to Support Nuclear Plant Sustainability  

SciTech Connect (OSTI)

The U.S. Department of Energys Light Water Reactor Sustainability program has developed a control room simulator in support of control room modernization at nuclear power plants in the U.S. This report highlights the recent completion of this reconfigurable, full-scale, full-scope control room simulator buildout at the Idaho National Laboratory. The simulator is fully reconfigurable, meaning it supports multiple plant models developed by different simulator vendors. The simulator is full-scale, using glasstop virtual panels to display the analog control boards found at current plants. The present installation features 15 glasstop panels, uniquely achieving a complete control room representation. The simulator is also full-scope, meaning it uses the same plant models used for training simulators at actual plants. Unlike in the plant training simulators, the deployment on glasstop panels allows a high degree of customization of the panels, allowing the simulator to be used for research on the design of new digital control systems for control room modernization. This report includes separate sections discussing the glasstop panels, their layout to mimic control rooms at actual plants, technical details on creating a multi-plant and multi-vendor reconfigurable simulator, and current efforts to support control room modernization at U.S. utilities. The glasstop simulator provides an ideal testbed for prototyping and validating new control room concepts. Equally importantly, it is helping create a standardized and vetted human factors engineering process that can be used across the nuclear industry to ensure control room upgrades maintain and even improve current reliability and safety.

Ronald L. Boring; Vivek Agarwal; Kirk Fitzgerald; Jacques Hugo; Bruce Hallbert

2013-03-01T23:59:59.000Z

498

Solar power satellite antenna phase control system hardware simulation, phase 4. Volume 3: SOLARSIM users manual. Final report  

SciTech Connect (OSTI)

Documentation of the interactive software package designed to predict the effect of certain electrical and mechanical imperfections on the performance of the SPS system is presented. The capabilities of the SOLARSIM program to quantify the spacetenna performance parameter values are described. The SOLARSIM package can compute the RMS pointing error, title effects, MPTX code tracking loop performance, MPTX carrier tracking loop performance, averaged power pattern, and the power transfer efficiency.

Lindsey, W.C.; Kantak, A.V.; Chie, C.M.

1981-03-01T23:59:59.000Z

499

Application of TS-Fuzzy Controller for Active Power and DC Capacitor Voltage Control in DFIG-Based Wind Energy Conversion Systems  

Science Journals Connector (OSTI)

This chapter focuses on the implementation of the TS (Tagaki-Sugino) fuzzy controller for the Doubly Fed Induction Generator (DFIG) based wind generator. The conventional PI ... is compared with the TS fuzzy cont...

S. Mishra; Y. Mishra; Fangxing Li; Z. Y. Dong

2010-01-01T23:59:59.000Z

500

Power Station Efficiency Control: a Treatise for the Power Station Engineer on Boiler-Room Efficiency, Turbine-Room Efficiency, Heat Balance Control, Methods of Recording and Tabulating Operating Results and Keeping a Day to Day Check on Operating Efficiency  

Science Journals Connector (OSTI)

... improvements have been made in recent years, with a consequent increase in the over-all efficiency of generation. All the coal used is now weighed with high accuracy. The temperature ... , thanks to scientific investigations, there are power stations in various places with a thermal efficiency of more than 18 per cent. Most of the improvement is due to increased ...

1924-10-18T23:59:59.000Z